diff --git a/your-code/main.ipynb b/your-code/main.ipynb
index 7687137..653ceea 100644
--- a/your-code/main.ipynb
+++ b/your-code/main.ipynb
@@ -16,7 +16,9 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "# import numpy and pandas"
+    "# import numpy and pandas\n",
+    "import numpy as np\n",
+    "import pandas as pd"
    ]
   },
   {
@@ -38,7 +40,134 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "admissions = pd.read_csv('data/Admission_Predict.csv')"
+    "admissions = pd.read_csv(r'G:\\My Drive\\Ironhack\\lab-advanced-topics-with-pandas\\data\\Admission_Predict.csv')"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 3,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/html": [
+       "<div>\n",
+       "<style scoped>\n",
+       "    .dataframe tbody tr th:only-of-type {\n",
+       "        vertical-align: middle;\n",
+       "    }\n",
+       "\n",
+       "    .dataframe tbody tr th {\n",
+       "        vertical-align: top;\n",
+       "    }\n",
+       "\n",
+       "    .dataframe thead th {\n",
+       "        text-align: right;\n",
+       "    }\n",
+       "</style>\n",
+       "<table border=\"1\" class=\"dataframe\">\n",
+       "  <thead>\n",
+       "    <tr style=\"text-align: right;\">\n",
+       "      <th></th>\n",
+       "      <th>Serial No.</th>\n",
+       "      <th>GRE Score</th>\n",
+       "      <th>TOEFL Score</th>\n",
+       "      <th>University Rating</th>\n",
+       "      <th>SOP</th>\n",
+       "      <th>LOR</th>\n",
+       "      <th>CGPA</th>\n",
+       "      <th>Research</th>\n",
+       "      <th>Chance of Admit</th>\n",
+       "    </tr>\n",
+       "  </thead>\n",
+       "  <tbody>\n",
+       "    <tr>\n",
+       "      <th>0</th>\n",
+       "      <td>1</td>\n",
+       "      <td>337</td>\n",
+       "      <td>118</td>\n",
+       "      <td>4</td>\n",
+       "      <td>4.5</td>\n",
+       "      <td>4.5</td>\n",
+       "      <td>9.65</td>\n",
+       "      <td>1</td>\n",
+       "      <td>0.92</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>1</th>\n",
+       "      <td>2</td>\n",
+       "      <td>316</td>\n",
+       "      <td>104</td>\n",
+       "      <td>3</td>\n",
+       "      <td>3.0</td>\n",
+       "      <td>3.5</td>\n",
+       "      <td>8.00</td>\n",
+       "      <td>1</td>\n",
+       "      <td>0.72</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>2</th>\n",
+       "      <td>3</td>\n",
+       "      <td>322</td>\n",
+       "      <td>110</td>\n",
+       "      <td>3</td>\n",
+       "      <td>3.5</td>\n",
+       "      <td>2.5</td>\n",
+       "      <td>8.67</td>\n",
+       "      <td>1</td>\n",
+       "      <td>0.80</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>3</th>\n",
+       "      <td>4</td>\n",
+       "      <td>314</td>\n",
+       "      <td>103</td>\n",
+       "      <td>2</td>\n",
+       "      <td>2.0</td>\n",
+       "      <td>3.0</td>\n",
+       "      <td>8.21</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0.65</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>4</th>\n",
+       "      <td>5</td>\n",
+       "      <td>330</td>\n",
+       "      <td>115</td>\n",
+       "      <td>5</td>\n",
+       "      <td>4.5</td>\n",
+       "      <td>3.0</td>\n",
+       "      <td>9.34</td>\n",
+       "      <td>1</td>\n",
+       "      <td>0.90</td>\n",
+       "    </tr>\n",
+       "  </tbody>\n",
+       "</table>\n",
+       "</div>"
+      ],
+      "text/plain": [
+       "   Serial No.  GRE Score  TOEFL Score  University Rating  SOP  LOR   CGPA  \\\n",
+       "0           1        337          118                  4  4.5   4.5  9.65   \n",
+       "1           2        316          104                  3  3.0   3.5  8.00   \n",
+       "2           3        322          110                  3  3.5   2.5  8.67   \n",
+       "3           4        314          103                  2  2.0   3.0  8.21   \n",
+       "4           5        330          115                  5  4.5   3.0  9.34   \n",
+       "\n",
+       "   Research  Chance of Admit   \n",
+       "0         1              0.92  \n",
+       "1         1              0.72  \n",
+       "2         1              0.80  \n",
+       "3         0              0.65  \n",
+       "4         1              0.90  "
+      ]
+     },
+     "execution_count": 3,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "admissions.head()"
    ]
   },
   {
@@ -50,9 +179,22 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 4,
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "Index(['Serial No.', 'GRE Score', 'TOEFL Score', 'University Rating', 'SOP',\n",
+       "       'LOR', 'CGPA', 'Research', 'Chance of Admit'],\n",
+       "      dtype='object')"
+      ]
+     },
+     "execution_count": 4,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
    "source": [
     "admissions.columns = [col.strip() for col in admissions.columns]\n",
     "admissions.columns\n",
@@ -70,11 +212,130 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 5,
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "data": {
+      "text/html": [
+       "<div>\n",
+       "<style scoped>\n",
+       "    .dataframe tbody tr th:only-of-type {\n",
+       "        vertical-align: middle;\n",
+       "    }\n",
+       "\n",
+       "    .dataframe tbody tr th {\n",
+       "        vertical-align: top;\n",
+       "    }\n",
+       "\n",
+       "    .dataframe thead th {\n",
+       "        text-align: right;\n",
+       "    }\n",
+       "</style>\n",
+       "<table border=\"1\" class=\"dataframe\">\n",
+       "  <thead>\n",
+       "    <tr style=\"text-align: right;\">\n",
+       "      <th></th>\n",
+       "      <th>Serial No.</th>\n",
+       "      <th>GRE Score</th>\n",
+       "      <th>TOEFL Score</th>\n",
+       "      <th>University Rating</th>\n",
+       "      <th>SOP</th>\n",
+       "      <th>LOR</th>\n",
+       "      <th>CGPA</th>\n",
+       "      <th>Research</th>\n",
+       "      <th>Chance of Admit</th>\n",
+       "    </tr>\n",
+       "  </thead>\n",
+       "  <tbody>\n",
+       "    <tr>\n",
+       "      <th>0</th>\n",
+       "      <td>1</td>\n",
+       "      <td>337</td>\n",
+       "      <td>118</td>\n",
+       "      <td>4</td>\n",
+       "      <td>4.5</td>\n",
+       "      <td>4.5</td>\n",
+       "      <td>9.65</td>\n",
+       "      <td>1</td>\n",
+       "      <td>0.92</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>1</th>\n",
+       "      <td>2</td>\n",
+       "      <td>316</td>\n",
+       "      <td>104</td>\n",
+       "      <td>3</td>\n",
+       "      <td>3.0</td>\n",
+       "      <td>3.5</td>\n",
+       "      <td>8.00</td>\n",
+       "      <td>1</td>\n",
+       "      <td>0.72</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>2</th>\n",
+       "      <td>3</td>\n",
+       "      <td>322</td>\n",
+       "      <td>110</td>\n",
+       "      <td>3</td>\n",
+       "      <td>3.5</td>\n",
+       "      <td>2.5</td>\n",
+       "      <td>8.67</td>\n",
+       "      <td>1</td>\n",
+       "      <td>0.80</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>3</th>\n",
+       "      <td>4</td>\n",
+       "      <td>314</td>\n",
+       "      <td>103</td>\n",
+       "      <td>2</td>\n",
+       "      <td>2.0</td>\n",
+       "      <td>3.0</td>\n",
+       "      <td>8.21</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0.65</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>4</th>\n",
+       "      <td>5</td>\n",
+       "      <td>330</td>\n",
+       "      <td>115</td>\n",
+       "      <td>5</td>\n",
+       "      <td>4.5</td>\n",
+       "      <td>3.0</td>\n",
+       "      <td>9.34</td>\n",
+       "      <td>1</td>\n",
+       "      <td>0.90</td>\n",
+       "    </tr>\n",
+       "  </tbody>\n",
+       "</table>\n",
+       "</div>"
+      ],
+      "text/plain": [
+       "   Serial No.  GRE Score  TOEFL Score  University Rating  SOP  LOR  CGPA  \\\n",
+       "0           1        337          118                  4  4.5  4.5  9.65   \n",
+       "1           2        316          104                  3  3.0  3.5  8.00   \n",
+       "2           3        322          110                  3  3.5  2.5  8.67   \n",
+       "3           4        314          103                  2  2.0  3.0  8.21   \n",
+       "4           5        330          115                  5  4.5  3.0  9.34   \n",
+       "\n",
+       "   Research  Chance of Admit  \n",
+       "0         1             0.92  \n",
+       "1         1             0.72  \n",
+       "2         1             0.80  \n",
+       "3         0             0.65  \n",
+       "4         1             0.90  "
+      ]
+     },
+     "execution_count": 5,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
    "source": [
-    "# Your code here:"
+    "# Your code here:\n",
+    "admissions.head()"
    ]
   },
   {
@@ -86,11 +347,32 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 6,
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "Serial No.           0\n",
+       "GRE Score            0\n",
+       "TOEFL Score          0\n",
+       "University Rating    0\n",
+       "SOP                  0\n",
+       "LOR                  0\n",
+       "CGPA                 0\n",
+       "Research             0\n",
+       "Chance of Admit      0\n",
+       "dtype: int64"
+      ]
+     },
+     "execution_count": 6,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
    "source": [
-    "# Your code here:"
+    "# Your code here:\n",
+    "admissions.isnull().sum()"
    ]
   },
   {
@@ -102,11 +384,218 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 6,
+   "execution_count": 7,
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "data": {
+      "text/html": [
+       "<div>\n",
+       "<style scoped>\n",
+       "    .dataframe tbody tr th:only-of-type {\n",
+       "        vertical-align: middle;\n",
+       "    }\n",
+       "\n",
+       "    .dataframe tbody tr th {\n",
+       "        vertical-align: top;\n",
+       "    }\n",
+       "\n",
+       "    .dataframe thead th {\n",
+       "        text-align: right;\n",
+       "    }\n",
+       "</style>\n",
+       "<table border=\"1\" class=\"dataframe\">\n",
+       "  <thead>\n",
+       "    <tr style=\"text-align: right;\">\n",
+       "      <th></th>\n",
+       "      <th>GRE Score</th>\n",
+       "      <th>TOEFL Score</th>\n",
+       "      <th>University Rating</th>\n",
+       "      <th>SOP</th>\n",
+       "      <th>LOR</th>\n",
+       "      <th>CGPA</th>\n",
+       "      <th>Research</th>\n",
+       "      <th>Chance of Admit</th>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>Serial No.</th>\n",
+       "      <th></th>\n",
+       "      <th></th>\n",
+       "      <th></th>\n",
+       "      <th></th>\n",
+       "      <th></th>\n",
+       "      <th></th>\n",
+       "      <th></th>\n",
+       "      <th></th>\n",
+       "    </tr>\n",
+       "  </thead>\n",
+       "  <tbody>\n",
+       "    <tr>\n",
+       "      <th>1</th>\n",
+       "      <td>337</td>\n",
+       "      <td>118</td>\n",
+       "      <td>4</td>\n",
+       "      <td>4.5</td>\n",
+       "      <td>4.5</td>\n",
+       "      <td>9.65</td>\n",
+       "      <td>1</td>\n",
+       "      <td>0.92</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>2</th>\n",
+       "      <td>316</td>\n",
+       "      <td>104</td>\n",
+       "      <td>3</td>\n",
+       "      <td>3.0</td>\n",
+       "      <td>3.5</td>\n",
+       "      <td>8.00</td>\n",
+       "      <td>1</td>\n",
+       "      <td>0.72</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>3</th>\n",
+       "      <td>322</td>\n",
+       "      <td>110</td>\n",
+       "      <td>3</td>\n",
+       "      <td>3.5</td>\n",
+       "      <td>2.5</td>\n",
+       "      <td>8.67</td>\n",
+       "      <td>1</td>\n",
+       "      <td>0.80</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>4</th>\n",
+       "      <td>314</td>\n",
+       "      <td>103</td>\n",
+       "      <td>2</td>\n",
+       "      <td>2.0</td>\n",
+       "      <td>3.0</td>\n",
+       "      <td>8.21</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0.65</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>5</th>\n",
+       "      <td>330</td>\n",
+       "      <td>115</td>\n",
+       "      <td>5</td>\n",
+       "      <td>4.5</td>\n",
+       "      <td>3.0</td>\n",
+       "      <td>9.34</td>\n",
+       "      <td>1</td>\n",
+       "      <td>0.90</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>...</th>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>381</th>\n",
+       "      <td>324</td>\n",
+       "      <td>110</td>\n",
+       "      <td>3</td>\n",
+       "      <td>3.5</td>\n",
+       "      <td>3.5</td>\n",
+       "      <td>9.04</td>\n",
+       "      <td>1</td>\n",
+       "      <td>0.82</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>382</th>\n",
+       "      <td>325</td>\n",
+       "      <td>107</td>\n",
+       "      <td>3</td>\n",
+       "      <td>3.0</td>\n",
+       "      <td>3.5</td>\n",
+       "      <td>9.11</td>\n",
+       "      <td>1</td>\n",
+       "      <td>0.84</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>383</th>\n",
+       "      <td>330</td>\n",
+       "      <td>116</td>\n",
+       "      <td>4</td>\n",
+       "      <td>5.0</td>\n",
+       "      <td>4.5</td>\n",
+       "      <td>9.45</td>\n",
+       "      <td>1</td>\n",
+       "      <td>0.91</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>384</th>\n",
+       "      <td>312</td>\n",
+       "      <td>103</td>\n",
+       "      <td>3</td>\n",
+       "      <td>3.5</td>\n",
+       "      <td>4.0</td>\n",
+       "      <td>8.78</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0.67</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>385</th>\n",
+       "      <td>333</td>\n",
+       "      <td>117</td>\n",
+       "      <td>4</td>\n",
+       "      <td>5.0</td>\n",
+       "      <td>4.0</td>\n",
+       "      <td>9.66</td>\n",
+       "      <td>1</td>\n",
+       "      <td>0.95</td>\n",
+       "    </tr>\n",
+       "  </tbody>\n",
+       "</table>\n",
+       "<p>385 rows × 8 columns</p>\n",
+       "</div>"
+      ],
+      "text/plain": [
+       "            GRE Score  TOEFL Score  University Rating  SOP  LOR  CGPA  \\\n",
+       "Serial No.                                                              \n",
+       "1                 337          118                  4  4.5  4.5  9.65   \n",
+       "2                 316          104                  3  3.0  3.5  8.00   \n",
+       "3                 322          110                  3  3.5  2.5  8.67   \n",
+       "4                 314          103                  2  2.0  3.0  8.21   \n",
+       "5                 330          115                  5  4.5  3.0  9.34   \n",
+       "...               ...          ...                ...  ...  ...   ...   \n",
+       "381               324          110                  3  3.5  3.5  9.04   \n",
+       "382               325          107                  3  3.0  3.5  9.11   \n",
+       "383               330          116                  4  5.0  4.5  9.45   \n",
+       "384               312          103                  3  3.5  4.0  8.78   \n",
+       "385               333          117                  4  5.0  4.0  9.66   \n",
+       "\n",
+       "            Research  Chance of Admit  \n",
+       "Serial No.                             \n",
+       "1                  1             0.92  \n",
+       "2                  1             0.72  \n",
+       "3                  1             0.80  \n",
+       "4                  0             0.65  \n",
+       "5                  1             0.90  \n",
+       "...              ...              ...  \n",
+       "381                1             0.82  \n",
+       "382                1             0.84  \n",
+       "383                1             0.91  \n",
+       "384                0             0.67  \n",
+       "385                1             0.95  \n",
+       "\n",
+       "[385 rows x 8 columns]"
+      ]
+     },
+     "execution_count": 7,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
    "source": [
-    "# Your code here:"
+    "# Your code here:\n",
+    "admissions.set_index(\"Serial No.\")"
    ]
   },
   {
@@ -118,13 +607,22 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
-   "metadata": {
-    "scrolled": true
-   },
-   "outputs": [],
+   "execution_count": 8,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "0"
+      ]
+     },
+     "execution_count": 8,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
    "source": [
-    "# Your code here:"
+    "admissions.duplicated(subset=[\"GRE Score\", \"CGPA\"]).sum()"
    ]
   },
   {
@@ -136,11 +634,227 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 8,
+   "execution_count": 9,
    "metadata": {},
    "outputs": [],
    "source": [
-    "# Your code here:"
+    "# Your code here:\n",
+    "admissions.set_index([\"GRE Score\", \"CGPA\"], inplace=True)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 10,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/html": [
+       "<div>\n",
+       "<style scoped>\n",
+       "    .dataframe tbody tr th:only-of-type {\n",
+       "        vertical-align: middle;\n",
+       "    }\n",
+       "\n",
+       "    .dataframe tbody tr th {\n",
+       "        vertical-align: top;\n",
+       "    }\n",
+       "\n",
+       "    .dataframe thead th {\n",
+       "        text-align: right;\n",
+       "    }\n",
+       "</style>\n",
+       "<table border=\"1\" class=\"dataframe\">\n",
+       "  <thead>\n",
+       "    <tr style=\"text-align: right;\">\n",
+       "      <th></th>\n",
+       "      <th></th>\n",
+       "      <th>Serial No.</th>\n",
+       "      <th>TOEFL Score</th>\n",
+       "      <th>University Rating</th>\n",
+       "      <th>SOP</th>\n",
+       "      <th>LOR</th>\n",
+       "      <th>Research</th>\n",
+       "      <th>Chance of Admit</th>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>GRE Score</th>\n",
+       "      <th>CGPA</th>\n",
+       "      <th></th>\n",
+       "      <th></th>\n",
+       "      <th></th>\n",
+       "      <th></th>\n",
+       "      <th></th>\n",
+       "      <th></th>\n",
+       "      <th></th>\n",
+       "    </tr>\n",
+       "  </thead>\n",
+       "  <tbody>\n",
+       "    <tr>\n",
+       "      <th>337</th>\n",
+       "      <th>9.65</th>\n",
+       "      <td>1</td>\n",
+       "      <td>118</td>\n",
+       "      <td>4</td>\n",
+       "      <td>4.5</td>\n",
+       "      <td>4.5</td>\n",
+       "      <td>1</td>\n",
+       "      <td>0.92</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>316</th>\n",
+       "      <th>8.00</th>\n",
+       "      <td>2</td>\n",
+       "      <td>104</td>\n",
+       "      <td>3</td>\n",
+       "      <td>3.0</td>\n",
+       "      <td>3.5</td>\n",
+       "      <td>1</td>\n",
+       "      <td>0.72</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>322</th>\n",
+       "      <th>8.67</th>\n",
+       "      <td>3</td>\n",
+       "      <td>110</td>\n",
+       "      <td>3</td>\n",
+       "      <td>3.5</td>\n",
+       "      <td>2.5</td>\n",
+       "      <td>1</td>\n",
+       "      <td>0.80</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>314</th>\n",
+       "      <th>8.21</th>\n",
+       "      <td>4</td>\n",
+       "      <td>103</td>\n",
+       "      <td>2</td>\n",
+       "      <td>2.0</td>\n",
+       "      <td>3.0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0.65</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>330</th>\n",
+       "      <th>9.34</th>\n",
+       "      <td>5</td>\n",
+       "      <td>115</td>\n",
+       "      <td>5</td>\n",
+       "      <td>4.5</td>\n",
+       "      <td>3.0</td>\n",
+       "      <td>1</td>\n",
+       "      <td>0.90</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>...</th>\n",
+       "      <th>...</th>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>324</th>\n",
+       "      <th>9.04</th>\n",
+       "      <td>381</td>\n",
+       "      <td>110</td>\n",
+       "      <td>3</td>\n",
+       "      <td>3.5</td>\n",
+       "      <td>3.5</td>\n",
+       "      <td>1</td>\n",
+       "      <td>0.82</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>325</th>\n",
+       "      <th>9.11</th>\n",
+       "      <td>382</td>\n",
+       "      <td>107</td>\n",
+       "      <td>3</td>\n",
+       "      <td>3.0</td>\n",
+       "      <td>3.5</td>\n",
+       "      <td>1</td>\n",
+       "      <td>0.84</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>330</th>\n",
+       "      <th>9.45</th>\n",
+       "      <td>383</td>\n",
+       "      <td>116</td>\n",
+       "      <td>4</td>\n",
+       "      <td>5.0</td>\n",
+       "      <td>4.5</td>\n",
+       "      <td>1</td>\n",
+       "      <td>0.91</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>312</th>\n",
+       "      <th>8.78</th>\n",
+       "      <td>384</td>\n",
+       "      <td>103</td>\n",
+       "      <td>3</td>\n",
+       "      <td>3.5</td>\n",
+       "      <td>4.0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0.67</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>333</th>\n",
+       "      <th>9.66</th>\n",
+       "      <td>385</td>\n",
+       "      <td>117</td>\n",
+       "      <td>4</td>\n",
+       "      <td>5.0</td>\n",
+       "      <td>4.0</td>\n",
+       "      <td>1</td>\n",
+       "      <td>0.95</td>\n",
+       "    </tr>\n",
+       "  </tbody>\n",
+       "</table>\n",
+       "<p>385 rows × 7 columns</p>\n",
+       "</div>"
+      ],
+      "text/plain": [
+       "                Serial No.  TOEFL Score  University Rating  SOP  LOR  \\\n",
+       "GRE Score CGPA                                                         \n",
+       "337       9.65           1          118                  4  4.5  4.5   \n",
+       "316       8.00           2          104                  3  3.0  3.5   \n",
+       "322       8.67           3          110                  3  3.5  2.5   \n",
+       "314       8.21           4          103                  2  2.0  3.0   \n",
+       "330       9.34           5          115                  5  4.5  3.0   \n",
+       "...                    ...          ...                ...  ...  ...   \n",
+       "324       9.04         381          110                  3  3.5  3.5   \n",
+       "325       9.11         382          107                  3  3.0  3.5   \n",
+       "330       9.45         383          116                  4  5.0  4.5   \n",
+       "312       8.78         384          103                  3  3.5  4.0   \n",
+       "333       9.66         385          117                  4  5.0  4.0   \n",
+       "\n",
+       "                Research  Chance of Admit  \n",
+       "GRE Score CGPA                             \n",
+       "337       9.65         1             0.92  \n",
+       "316       8.00         1             0.72  \n",
+       "322       8.67         1             0.80  \n",
+       "314       8.21         0             0.65  \n",
+       "330       9.34         1             0.90  \n",
+       "...                  ...              ...  \n",
+       "324       9.04         1             0.82  \n",
+       "325       9.11         1             0.84  \n",
+       "330       9.45         1             0.91  \n",
+       "312       8.78         0             0.67  \n",
+       "333       9.66         1             0.95  \n",
+       "\n",
+       "[385 rows x 7 columns]"
+      ]
+     },
+     "execution_count": 10,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "admissions"
    ]
   },
   {
@@ -152,11 +866,218 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 11,
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "data": {
+      "text/html": [
+       "<div>\n",
+       "<style scoped>\n",
+       "    .dataframe tbody tr th:only-of-type {\n",
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+       "\n",
+       "    .dataframe tbody tr th {\n",
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+       "  <thead>\n",
+       "    <tr style=\"text-align: right;\">\n",
+       "      <th></th>\n",
+       "      <th>GRE Score</th>\n",
+       "      <th>CGPA</th>\n",
+       "      <th>Serial No.</th>\n",
+       "      <th>TOEFL Score</th>\n",
+       "      <th>University Rating</th>\n",
+       "      <th>SOP</th>\n",
+       "      <th>LOR</th>\n",
+       "      <th>Research</th>\n",
+       "      <th>Chance of Admit</th>\n",
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+       "  <tbody>\n",
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+       "      <th>0</th>\n",
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+       "      <td>1</td>\n",
+       "      <td>0.92</td>\n",
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+       "    <tr>\n",
+       "      <th>1</th>\n",
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+       "      <td>2</td>\n",
+       "      <td>104</td>\n",
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+       "      <td>1</td>\n",
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+       "    <tr>\n",
+       "      <th>2</th>\n",
+       "      <td>322</td>\n",
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+       "      <td>3</td>\n",
+       "      <td>110</td>\n",
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+       "      <td>2.5</td>\n",
+       "      <td>1</td>\n",
+       "      <td>0.80</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>3</th>\n",
+       "      <td>314</td>\n",
+       "      <td>8.21</td>\n",
+       "      <td>4</td>\n",
+       "      <td>103</td>\n",
+       "      <td>2</td>\n",
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+       "      <td>3.0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0.65</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>4</th>\n",
+       "      <td>330</td>\n",
+       "      <td>9.34</td>\n",
+       "      <td>5</td>\n",
+       "      <td>115</td>\n",
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+       "      <td>3.0</td>\n",
+       "      <td>1</td>\n",
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+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>...</th>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>380</th>\n",
+       "      <td>324</td>\n",
+       "      <td>9.04</td>\n",
+       "      <td>381</td>\n",
+       "      <td>110</td>\n",
+       "      <td>3</td>\n",
+       "      <td>3.5</td>\n",
+       "      <td>3.5</td>\n",
+       "      <td>1</td>\n",
+       "      <td>0.82</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>381</th>\n",
+       "      <td>325</td>\n",
+       "      <td>9.11</td>\n",
+       "      <td>382</td>\n",
+       "      <td>107</td>\n",
+       "      <td>3</td>\n",
+       "      <td>3.0</td>\n",
+       "      <td>3.5</td>\n",
+       "      <td>1</td>\n",
+       "      <td>0.84</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>382</th>\n",
+       "      <td>330</td>\n",
+       "      <td>9.45</td>\n",
+       "      <td>383</td>\n",
+       "      <td>116</td>\n",
+       "      <td>4</td>\n",
+       "      <td>5.0</td>\n",
+       "      <td>4.5</td>\n",
+       "      <td>1</td>\n",
+       "      <td>0.91</td>\n",
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+       "    <tr>\n",
+       "      <th>383</th>\n",
+       "      <td>312</td>\n",
+       "      <td>8.78</td>\n",
+       "      <td>384</td>\n",
+       "      <td>103</td>\n",
+       "      <td>3</td>\n",
+       "      <td>3.5</td>\n",
+       "      <td>4.0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0.67</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>384</th>\n",
+       "      <td>333</td>\n",
+       "      <td>9.66</td>\n",
+       "      <td>385</td>\n",
+       "      <td>117</td>\n",
+       "      <td>4</td>\n",
+       "      <td>5.0</td>\n",
+       "      <td>4.0</td>\n",
+       "      <td>1</td>\n",
+       "      <td>0.95</td>\n",
+       "    </tr>\n",
+       "  </tbody>\n",
+       "</table>\n",
+       "<p>385 rows × 9 columns</p>\n",
+       "</div>"
+      ],
+      "text/plain": [
+       "     GRE Score  CGPA  Serial No.  TOEFL Score  University Rating  SOP  LOR  \\\n",
+       "0          337  9.65           1          118                  4  4.5  4.5   \n",
+       "1          316  8.00           2          104                  3  3.0  3.5   \n",
+       "2          322  8.67           3          110                  3  3.5  2.5   \n",
+       "3          314  8.21           4          103                  2  2.0  3.0   \n",
+       "4          330  9.34           5          115                  5  4.5  3.0   \n",
+       "..         ...   ...         ...          ...                ...  ...  ...   \n",
+       "380        324  9.04         381          110                  3  3.5  3.5   \n",
+       "381        325  9.11         382          107                  3  3.0  3.5   \n",
+       "382        330  9.45         383          116                  4  5.0  4.5   \n",
+       "383        312  8.78         384          103                  3  3.5  4.0   \n",
+       "384        333  9.66         385          117                  4  5.0  4.0   \n",
+       "\n",
+       "     Research  Chance of Admit  \n",
+       "0           1             0.92  \n",
+       "1           1             0.72  \n",
+       "2           1             0.80  \n",
+       "3           0             0.65  \n",
+       "4           1             0.90  \n",
+       "..        ...              ...  \n",
+       "380         1             0.82  \n",
+       "381         1             0.84  \n",
+       "382         1             0.91  \n",
+       "383         0             0.67  \n",
+       "384         1             0.95  \n",
+       "\n",
+       "[385 rows x 9 columns]"
+      ]
+     },
+     "execution_count": 11,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
    "source": [
-    "# Your code here:"
+    "# Your code here:\n",
+    "admissions.reset_index(inplace=True)\n",
+    "admissions"
    ]
   },
   {
@@ -170,11 +1091,217 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 12,
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "data": {
+      "text/html": [
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+       "\n",
+       "    .dataframe tbody tr th {\n",
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+       "\n",
+       "    .dataframe thead th {\n",
+       "        text-align: right;\n",
+       "    }\n",
+       "</style>\n",
+       "<table border=\"1\" class=\"dataframe\">\n",
+       "  <thead>\n",
+       "    <tr style=\"text-align: right;\">\n",
+       "      <th></th>\n",
+       "      <th>GRE Score</th>\n",
+       "      <th>CGPA</th>\n",
+       "      <th>Serial No.</th>\n",
+       "      <th>TOEFL Score</th>\n",
+       "      <th>University Rating</th>\n",
+       "      <th>SOP</th>\n",
+       "      <th>LOR</th>\n",
+       "      <th>Research</th>\n",
+       "      <th>Chance of Admit</th>\n",
+       "    </tr>\n",
+       "  </thead>\n",
+       "  <tbody>\n",
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+       "      <td>4</td>\n",
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+       "      <td>0.92</td>\n",
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+       "    <tr>\n",
+       "      <th>4</th>\n",
+       "      <td>330</td>\n",
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+       "    <tr>\n",
+       "      <th>10</th>\n",
+       "      <td>328</td>\n",
+       "      <td>9.10</td>\n",
+       "      <td>11</td>\n",
+       "      <td>112</td>\n",
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+       "    <tr>\n",
+       "      <th>19</th>\n",
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+       "      <td>116</td>\n",
+       "      <td>5</td>\n",
+       "      <td>5.0</td>\n",
+       "      <td>5.0</td>\n",
+       "      <td>1</td>\n",
+       "      <td>0.94</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>20</th>\n",
+       "      <td>334</td>\n",
+       "      <td>9.70</td>\n",
+       "      <td>21</td>\n",
+       "      <td>119</td>\n",
+       "      <td>5</td>\n",
+       "      <td>5.0</td>\n",
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+       "      <td>1</td>\n",
+       "      <td>0.95</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>...</th>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>379</th>\n",
+       "      <td>329</td>\n",
+       "      <td>9.23</td>\n",
+       "      <td>380</td>\n",
+       "      <td>111</td>\n",
+       "      <td>4</td>\n",
+       "      <td>4.5</td>\n",
+       "      <td>4.0</td>\n",
+       "      <td>1</td>\n",
+       "      <td>0.89</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>380</th>\n",
+       "      <td>324</td>\n",
+       "      <td>9.04</td>\n",
+       "      <td>381</td>\n",
+       "      <td>110</td>\n",
+       "      <td>3</td>\n",
+       "      <td>3.5</td>\n",
+       "      <td>3.5</td>\n",
+       "      <td>1</td>\n",
+       "      <td>0.82</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>381</th>\n",
+       "      <td>325</td>\n",
+       "      <td>9.11</td>\n",
+       "      <td>382</td>\n",
+       "      <td>107</td>\n",
+       "      <td>3</td>\n",
+       "      <td>3.0</td>\n",
+       "      <td>3.5</td>\n",
+       "      <td>1</td>\n",
+       "      <td>0.84</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>382</th>\n",
+       "      <td>330</td>\n",
+       "      <td>9.45</td>\n",
+       "      <td>383</td>\n",
+       "      <td>116</td>\n",
+       "      <td>4</td>\n",
+       "      <td>5.0</td>\n",
+       "      <td>4.5</td>\n",
+       "      <td>1</td>\n",
+       "      <td>0.91</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>384</th>\n",
+       "      <td>333</td>\n",
+       "      <td>9.66</td>\n",
+       "      <td>385</td>\n",
+       "      <td>117</td>\n",
+       "      <td>4</td>\n",
+       "      <td>5.0</td>\n",
+       "      <td>4.0</td>\n",
+       "      <td>1</td>\n",
+       "      <td>0.95</td>\n",
+       "    </tr>\n",
+       "  </tbody>\n",
+       "</table>\n",
+       "<p>101 rows × 9 columns</p>\n",
+       "</div>"
+      ],
+      "text/plain": [
+       "     GRE Score  CGPA  Serial No.  TOEFL Score  University Rating  SOP  LOR  \\\n",
+       "0          337  9.65           1          118                  4  4.5  4.5   \n",
+       "4          330  9.34           5          115                  5  4.5  3.0   \n",
+       "10         328  9.10          11          112                  4  4.0  4.5   \n",
+       "19         328  9.50          20          116                  5  5.0  5.0   \n",
+       "20         334  9.70          21          119                  5  5.0  4.5   \n",
+       "..         ...   ...         ...          ...                ...  ...  ...   \n",
+       "379        329  9.23         380          111                  4  4.5  4.0   \n",
+       "380        324  9.04         381          110                  3  3.5  3.5   \n",
+       "381        325  9.11         382          107                  3  3.0  3.5   \n",
+       "382        330  9.45         383          116                  4  5.0  4.5   \n",
+       "384        333  9.66         385          117                  4  5.0  4.0   \n",
+       "\n",
+       "     Research  Chance of Admit  \n",
+       "0           1             0.92  \n",
+       "4           1             0.90  \n",
+       "10          1             0.78  \n",
+       "19          1             0.94  \n",
+       "20          1             0.95  \n",
+       "..        ...              ...  \n",
+       "379         1             0.89  \n",
+       "380         1             0.82  \n",
+       "381         1             0.84  \n",
+       "382         1             0.91  \n",
+       "384         1             0.95  \n",
+       "\n",
+       "[101 rows x 9 columns]"
+      ]
+     },
+     "execution_count": 12,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
    "source": [
-    "# Your code here:"
+    "# Your code here:\n",
+    "admissions[(admissions[\"CGPA\"] > 9) & (admissions[\"Research\"] == 1)]"
    ]
   },
   {
@@ -186,11 +1313,23 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 13,
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "0.8"
+      ]
+     },
+     "execution_count": 13,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
    "source": [
-    "# Your code here:"
+    "# Your code here:\n",
+    "admissions[(admissions[\"CGPA\"] > 9) & (admissions[\"SOP\"] < 3.5)][\"Chance of Admit\"].mean().round(2)"
    ]
   },
   {
@@ -208,7 +1347,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 12,
+   "execution_count": 14,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -218,8 +1357,10 @@
     "    and returns a standardized column by subtracting the column's mean\n",
     "    and dividing by the column's standard deviation.\n",
     "    \"\"\"\n",
-    "   \n",
-    "   # Your code here:"
+    "    mean = col.mean()\n",
+    "    stdev = col.std()\n",
+    "    return (col - mean) / stdev\n",
+    "\n"
    ]
   },
   {
@@ -231,11 +1372,259 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 15,
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "data": {
+      "text/html": [
+       "<div>\n",
+       "<style scoped>\n",
+       "    .dataframe tbody tr th:only-of-type {\n",
+       "        vertical-align: middle;\n",
+       "    }\n",
+       "\n",
+       "    .dataframe tbody tr th {\n",
+       "        vertical-align: top;\n",
+       "    }\n",
+       "\n",
+       "    .dataframe thead th {\n",
+       "        text-align: right;\n",
+       "    }\n",
+       "</style>\n",
+       "<table border=\"1\" class=\"dataframe\">\n",
+       "  <thead>\n",
+       "    <tr style=\"text-align: right;\">\n",
+       "      <th></th>\n",
+       "      <th>GRE Score</th>\n",
+       "      <th>CGPA</th>\n",
+       "      <th>Serial No.</th>\n",
+       "      <th>TOEFL Score</th>\n",
+       "      <th>University Rating</th>\n",
+       "      <th>SOP</th>\n",
+       "      <th>LOR</th>\n",
+       "      <th>Research</th>\n",
+       "      <th>Chance of Admit</th>\n",
+       "      <th>CGPA_std</th>\n",
+       "      <th>GRE_std</th>\n",
+       "      <th>LOR_std</th>\n",
+       "    </tr>\n",
+       "  </thead>\n",
+       "  <tbody>\n",
+       "    <tr>\n",
+       "      <th>0</th>\n",
+       "      <td>337</td>\n",
+       "      <td>9.65</td>\n",
+       "      <td>1</td>\n",
+       "      <td>118</td>\n",
+       "      <td>4</td>\n",
+       "      <td>4.5</td>\n",
+       "      <td>4.5</td>\n",
+       "      <td>1</td>\n",
+       "      <td>0.92</td>\n",
+       "      <td>1.747900</td>\n",
+       "      <td>1.753381</td>\n",
+       "      <td>1.191647</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>1</th>\n",
+       "      <td>316</td>\n",
+       "      <td>8.00</td>\n",
+       "      <td>2</td>\n",
+       "      <td>104</td>\n",
+       "      <td>3</td>\n",
+       "      <td>3.0</td>\n",
+       "      <td>3.5</td>\n",
+       "      <td>1</td>\n",
+       "      <td>0.72</td>\n",
+       "      <td>-0.991211</td>\n",
+       "      <td>-0.063367</td>\n",
+       "      <td>0.076740</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>2</th>\n",
+       "      <td>322</td>\n",
+       "      <td>8.67</td>\n",
+       "      <td>3</td>\n",
+       "      <td>110</td>\n",
+       "      <td>3</td>\n",
+       "      <td>3.5</td>\n",
+       "      <td>2.5</td>\n",
+       "      <td>1</td>\n",
+       "      <td>0.80</td>\n",
+       "      <td>0.121034</td>\n",
+       "      <td>0.455704</td>\n",
+       "      <td>-1.038166</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>3</th>\n",
+       "      <td>314</td>\n",
+       "      <td>8.21</td>\n",
+       "      <td>4</td>\n",
+       "      <td>103</td>\n",
+       "      <td>2</td>\n",
+       "      <td>2.0</td>\n",
+       "      <td>3.0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0.65</td>\n",
+       "      <td>-0.642597</td>\n",
+       "      <td>-0.236391</td>\n",
+       "      <td>-0.480713</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>4</th>\n",
+       "      <td>330</td>\n",
+       "      <td>9.34</td>\n",
+       "      <td>5</td>\n",
+       "      <td>115</td>\n",
+       "      <td>5</td>\n",
+       "      <td>4.5</td>\n",
+       "      <td>3.0</td>\n",
+       "      <td>1</td>\n",
+       "      <td>0.90</td>\n",
+       "      <td>1.233279</td>\n",
+       "      <td>1.147798</td>\n",
+       "      <td>-0.480713</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>...</th>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>380</th>\n",
+       "      <td>324</td>\n",
+       "      <td>9.04</td>\n",
+       "      <td>381</td>\n",
+       "      <td>110</td>\n",
+       "      <td>3</td>\n",
+       "      <td>3.5</td>\n",
+       "      <td>3.5</td>\n",
+       "      <td>1</td>\n",
+       "      <td>0.82</td>\n",
+       "      <td>0.735259</td>\n",
+       "      <td>0.628727</td>\n",
+       "      <td>0.076740</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>381</th>\n",
+       "      <td>325</td>\n",
+       "      <td>9.11</td>\n",
+       "      <td>382</td>\n",
+       "      <td>107</td>\n",
+       "      <td>3</td>\n",
+       "      <td>3.0</td>\n",
+       "      <td>3.5</td>\n",
+       "      <td>1</td>\n",
+       "      <td>0.84</td>\n",
+       "      <td>0.851463</td>\n",
+       "      <td>0.715239</td>\n",
+       "      <td>0.076740</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>382</th>\n",
+       "      <td>330</td>\n",
+       "      <td>9.45</td>\n",
+       "      <td>383</td>\n",
+       "      <td>116</td>\n",
+       "      <td>4</td>\n",
+       "      <td>5.0</td>\n",
+       "      <td>4.5</td>\n",
+       "      <td>1</td>\n",
+       "      <td>0.91</td>\n",
+       "      <td>1.415886</td>\n",
+       "      <td>1.147798</td>\n",
+       "      <td>1.191647</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>383</th>\n",
+       "      <td>312</td>\n",
+       "      <td>8.78</td>\n",
+       "      <td>384</td>\n",
+       "      <td>103</td>\n",
+       "      <td>3</td>\n",
+       "      <td>3.5</td>\n",
+       "      <td>4.0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0.67</td>\n",
+       "      <td>0.303641</td>\n",
+       "      <td>-0.409414</td>\n",
+       "      <td>0.634193</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>384</th>\n",
+       "      <td>333</td>\n",
+       "      <td>9.66</td>\n",
+       "      <td>385</td>\n",
+       "      <td>117</td>\n",
+       "      <td>4</td>\n",
+       "      <td>5.0</td>\n",
+       "      <td>4.0</td>\n",
+       "      <td>1</td>\n",
+       "      <td>0.95</td>\n",
+       "      <td>1.764500</td>\n",
+       "      <td>1.407334</td>\n",
+       "      <td>0.634193</td>\n",
+       "    </tr>\n",
+       "  </tbody>\n",
+       "</table>\n",
+       "<p>385 rows × 12 columns</p>\n",
+       "</div>"
+      ],
+      "text/plain": [
+       "     GRE Score  CGPA  Serial No.  TOEFL Score  University Rating  SOP  LOR  \\\n",
+       "0          337  9.65           1          118                  4  4.5  4.5   \n",
+       "1          316  8.00           2          104                  3  3.0  3.5   \n",
+       "2          322  8.67           3          110                  3  3.5  2.5   \n",
+       "3          314  8.21           4          103                  2  2.0  3.0   \n",
+       "4          330  9.34           5          115                  5  4.5  3.0   \n",
+       "..         ...   ...         ...          ...                ...  ...  ...   \n",
+       "380        324  9.04         381          110                  3  3.5  3.5   \n",
+       "381        325  9.11         382          107                  3  3.0  3.5   \n",
+       "382        330  9.45         383          116                  4  5.0  4.5   \n",
+       "383        312  8.78         384          103                  3  3.5  4.0   \n",
+       "384        333  9.66         385          117                  4  5.0  4.0   \n",
+       "\n",
+       "     Research  Chance of Admit  CGPA_std   GRE_std   LOR_std  \n",
+       "0           1             0.92  1.747900  1.753381  1.191647  \n",
+       "1           1             0.72 -0.991211 -0.063367  0.076740  \n",
+       "2           1             0.80  0.121034  0.455704 -1.038166  \n",
+       "3           0             0.65 -0.642597 -0.236391 -0.480713  \n",
+       "4           1             0.90  1.233279  1.147798 -0.480713  \n",
+       "..        ...              ...       ...       ...       ...  \n",
+       "380         1             0.82  0.735259  0.628727  0.076740  \n",
+       "381         1             0.84  0.851463  0.715239  0.076740  \n",
+       "382         1             0.91  1.415886  1.147798  1.191647  \n",
+       "383         0             0.67  0.303641 -0.409414  0.634193  \n",
+       "384         1             0.95  1.764500  1.407334  0.634193  \n",
+       "\n",
+       "[385 rows x 12 columns]"
+      ]
+     },
+     "execution_count": 15,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
    "source": [
-    "# Your code here:"
+    "tests = [\"CGPA\", \"GRE Score\", \"LOR\"]\n",
+    "\n",
+    "for test in tests:\n",
+    "    admissions[f\"{test}_std\"] = standardize(admissions[test])\n",
+    "\n",
+    "admissions.rename(columns={\"GRE Score_std\": \"GRE_std\"}, inplace=True)\n",
+    "\n",
+    "admissions"
    ]
   },
   {
@@ -247,7 +1636,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 14,
+   "execution_count": 16,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -257,9 +1646,404 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 17,
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "['LOR_std',\n",
+       " 'LOR_std',\n",
+       " 'GRE_std',\n",
+       " 'LOR_std',\n",
+       " 'LOR_std',\n",
+       " 'GRE_std',\n",
+       " 'CGPA_std',\n",
+       " 'CGPA_std',\n",
+       " 'CGPA_std',\n",
+       " 'CGPA_std',\n",
+       " 'LOR_std',\n",
+       " 'LOR_std',\n",
+       " 'CGPA_std',\n",
+       " 'CGPA_std',\n",
+       " 'GRE_std',\n",
+       " 'GRE_std',\n",
+       " 'GRE_std',\n",
+       " 'GRE_std',\n",
+       " 'GRE_std',\n",
+       " 'GRE_std',\n",
+       " 'LOR_std',\n",
+       " 'CGPA_std',\n",
+       " 'CGPA_std',\n",
+       " 'LOR_std',\n",
+       " 'GRE_std',\n",
+       " 'LOR_std',\n",
+       " 'CGPA_std',\n",
+       " 'CGPA_std',\n",
+       " 'GRE_std',\n",
+       " 'GRE_std',\n",
+       " 'GRE_std',\n",
+       " 'GRE_std',\n",
+       " 'CGPA_std',\n",
+       " 'GRE_std',\n",
+       " 'GRE_std',\n",
+       " 'LOR_std',\n",
+       " 'CGPA_std',\n",
+       " 'LOR_std',\n",
+       " 'GRE_std',\n",
+       " 'GRE_std',\n",
+       " 'GRE_std',\n",
+       " 'LOR_std',\n",
+       " 'CGPA_std',\n",
+       " 'LOR_std',\n",
+       " 'CGPA_std',\n",
+       " 'CGPA_std',\n",
+       " 'LOR_std',\n",
+       " 'LOR_std',\n",
+       " 'LOR_std',\n",
+       " 'LOR_std',\n",
+       " 'CGPA_std',\n",
+       " 'LOR_std',\n",
+       " 'GRE_std',\n",
+       " 'LOR_std',\n",
+       " 'GRE_std',\n",
+       " 'GRE_std',\n",
+       " 'LOR_std',\n",
+       " 'GRE_std',\n",
+       " 'LOR_std',\n",
+       " 'CGPA_std',\n",
+       " 'GRE_std',\n",
+       " 'GRE_std',\n",
+       " 'GRE_std',\n",
+       " 'CGPA_std',\n",
+       " 'CGPA_std',\n",
+       " 'GRE_std',\n",
+       " 'CGPA_std',\n",
+       " 'CGPA_std',\n",
+       " 'GRE_std',\n",
+       " 'CGPA_std',\n",
+       " 'LOR_std',\n",
+       " 'CGPA_std',\n",
+       " 'CGPA_std',\n",
+       " 'LOR_std',\n",
+       " 'LOR_std',\n",
+       " 'CGPA_std',\n",
+       " 'LOR_std',\n",
+       " 'LOR_std',\n",
+       " 'GRE_std',\n",
+       " 'CGPA_std',\n",
+       " 'CGPA_std',\n",
+       " 'LOR_std',\n",
+       " 'CGPA_std',\n",
+       " 'GRE_std',\n",
+       " 'LOR_std',\n",
+       " 'CGPA_std',\n",
+       " 'CGPA_std',\n",
+       " 'GRE_std',\n",
+       " 'GRE_std',\n",
+       " 'LOR_std',\n",
+       " 'GRE_std',\n",
+       " 'CGPA_std',\n",
+       " 'LOR_std',\n",
+       " 'GRE_std',\n",
+       " 'CGPA_std',\n",
+       " 'CGPA_std',\n",
+       " 'LOR_std',\n",
+       " 'CGPA_std',\n",
+       " 'LOR_std',\n",
+       " 'GRE_std',\n",
+       " 'CGPA_std',\n",
+       " 'GRE_std',\n",
+       " 'GRE_std',\n",
+       " 'LOR_std',\n",
+       " 'CGPA_std',\n",
+       " 'CGPA_std',\n",
+       " 'GRE_std',\n",
+       " 'GRE_std',\n",
+       " 'GRE_std',\n",
+       " 'CGPA_std',\n",
+       " 'GRE_std',\n",
+       " 'LOR_std',\n",
+       " 'CGPA_std',\n",
+       " 'CGPA_std',\n",
+       " 'CGPA_std',\n",
+       " 'LOR_std',\n",
+       " 'CGPA_std',\n",
+       " 'CGPA_std',\n",
+       " 'CGPA_std',\n",
+       " 'CGPA_std',\n",
+       " 'GRE_std',\n",
+       " 'GRE_std',\n",
+       " 'LOR_std',\n",
+       " 'CGPA_std',\n",
+       " 'CGPA_std',\n",
+       " 'GRE_std',\n",
+       " 'GRE_std',\n",
+       " 'CGPA_std',\n",
+       " 'LOR_std',\n",
+       " 'CGPA_std',\n",
+       " 'LOR_std',\n",
+       " 'GRE_std',\n",
+       " 'CGPA_std',\n",
+       " 'LOR_std',\n",
+       " 'CGPA_std',\n",
+       " 'GRE_std',\n",
+       " 'LOR_std',\n",
+       " 'CGPA_std',\n",
+       " 'LOR_std',\n",
+       " 'GRE_std',\n",
+       " 'LOR_std',\n",
+       " 'GRE_std',\n",
+       " 'GRE_std',\n",
+       " 'GRE_std',\n",
+       " 'GRE_std',\n",
+       " 'CGPA_std',\n",
+       " 'CGPA_std',\n",
+       " 'LOR_std',\n",
+       " 'LOR_std',\n",
+       " 'LOR_std',\n",
+       " 'CGPA_std',\n",
+       " 'CGPA_std',\n",
+       " 'CGPA_std',\n",
+       " 'CGPA_std',\n",
+       " 'LOR_std',\n",
+       " 'LOR_std',\n",
+       " 'CGPA_std',\n",
+       " 'GRE_std',\n",
+       " 'LOR_std',\n",
+       " 'GRE_std',\n",
+       " 'CGPA_std',\n",
+       " 'GRE_std',\n",
+       " 'CGPA_std',\n",
+       " 'GRE_std',\n",
+       " 'GRE_std',\n",
+       " 'LOR_std',\n",
+       " 'CGPA_std',\n",
+       " 'CGPA_std',\n",
+       " 'GRE_std',\n",
+       " 'GRE_std',\n",
+       " 'CGPA_std',\n",
+       " 'GRE_std',\n",
+       " 'CGPA_std',\n",
+       " 'GRE_std',\n",
+       " 'CGPA_std',\n",
+       " 'GRE_std',\n",
+       " 'GRE_std',\n",
+       " 'GRE_std',\n",
+       " 'CGPA_std',\n",
+       " 'CGPA_std',\n",
+       " 'GRE_std',\n",
+       " 'CGPA_std',\n",
+       " 'GRE_std',\n",
+       " 'GRE_std',\n",
+       " 'CGPA_std',\n",
+       " 'GRE_std',\n",
+       " 'CGPA_std',\n",
+       " 'CGPA_std',\n",
+       " 'CGPA_std',\n",
+       " 'LOR_std',\n",
+       " 'GRE_std',\n",
+       " 'GRE_std',\n",
+       " 'GRE_std',\n",
+       " 'CGPA_std',\n",
+       " 'CGPA_std',\n",
+       " 'GRE_std',\n",
+       " 'GRE_std',\n",
+       " 'CGPA_std',\n",
+       " 'LOR_std',\n",
+       " 'CGPA_std',\n",
+       " 'GRE_std',\n",
+       " 'LOR_std',\n",
+       " 'LOR_std',\n",
+       " 'LOR_std',\n",
+       " 'LOR_std',\n",
+       " 'LOR_std',\n",
+       " 'GRE_std',\n",
+       " 'CGPA_std',\n",
+       " 'GRE_std',\n",
+       " 'GRE_std',\n",
+       " 'GRE_std',\n",
+       " 'LOR_std',\n",
+       " 'CGPA_std',\n",
+       " 'LOR_std',\n",
+       " 'LOR_std',\n",
+       " 'GRE_std',\n",
+       " 'GRE_std',\n",
+       " 'GRE_std',\n",
+       " 'LOR_std',\n",
+       " 'GRE_std',\n",
+       " 'CGPA_std',\n",
+       " 'GRE_std',\n",
+       " 'CGPA_std',\n",
+       " 'LOR_std',\n",
+       " 'GRE_std',\n",
+       " 'GRE_std',\n",
+       " 'CGPA_std',\n",
+       " 'LOR_std',\n",
+       " 'LOR_std',\n",
+       " 'LOR_std',\n",
+       " 'LOR_std',\n",
+       " 'CGPA_std',\n",
+       " 'GRE_std',\n",
+       " 'LOR_std',\n",
+       " 'LOR_std',\n",
+       " 'GRE_std',\n",
+       " 'LOR_std',\n",
+       " 'CGPA_std',\n",
+       " 'GRE_std',\n",
+       " 'CGPA_std',\n",
+       " 'CGPA_std',\n",
+       " 'CGPA_std',\n",
+       " 'LOR_std',\n",
+       " 'GRE_std',\n",
+       " 'GRE_std',\n",
+       " 'LOR_std',\n",
+       " 'CGPA_std',\n",
+       " 'LOR_std',\n",
+       " 'GRE_std',\n",
+       " 'LOR_std',\n",
+       " 'GRE_std',\n",
+       " 'LOR_std',\n",
+       " 'CGPA_std',\n",
+       " 'LOR_std',\n",
+       " 'GRE_std',\n",
+       " 'GRE_std',\n",
+       " 'LOR_std',\n",
+       " 'GRE_std',\n",
+       " 'LOR_std',\n",
+       " 'GRE_std',\n",
+       " 'LOR_std',\n",
+       " 'LOR_std',\n",
+       " 'CGPA_std',\n",
+       " 'GRE_std',\n",
+       " 'GRE_std',\n",
+       " 'CGPA_std',\n",
+       " 'CGPA_std',\n",
+       " 'GRE_std',\n",
+       " 'GRE_std',\n",
+       " 'GRE_std',\n",
+       " 'CGPA_std',\n",
+       " 'GRE_std',\n",
+       " 'GRE_std',\n",
+       " 'LOR_std',\n",
+       " 'CGPA_std',\n",
+       " 'CGPA_std',\n",
+       " 'LOR_std',\n",
+       " 'LOR_std',\n",
+       " 'GRE_std',\n",
+       " 'GRE_std',\n",
+       " 'GRE_std',\n",
+       " 'LOR_std',\n",
+       " 'LOR_std',\n",
+       " 'GRE_std',\n",
+       " 'LOR_std',\n",
+       " 'GRE_std',\n",
+       " 'GRE_std',\n",
+       " 'CGPA_std',\n",
+       " 'LOR_std',\n",
+       " 'LOR_std',\n",
+       " 'CGPA_std',\n",
+       " 'CGPA_std',\n",
+       " 'CGPA_std',\n",
+       " 'LOR_std',\n",
+       " 'CGPA_std',\n",
+       " 'GRE_std',\n",
+       " 'CGPA_std',\n",
+       " 'LOR_std',\n",
+       " 'LOR_std',\n",
+       " 'CGPA_std',\n",
+       " 'LOR_std',\n",
+       " 'CGPA_std',\n",
+       " 'CGPA_std',\n",
+       " 'GRE_std',\n",
+       " 'CGPA_std',\n",
+       " 'LOR_std',\n",
+       " 'LOR_std',\n",
+       " 'GRE_std',\n",
+       " 'GRE_std',\n",
+       " 'CGPA_std',\n",
+       " 'CGPA_std',\n",
+       " 'CGPA_std',\n",
+       " 'GRE_std',\n",
+       " 'LOR_std',\n",
+       " 'LOR_std',\n",
+       " 'LOR_std',\n",
+       " 'LOR_std',\n",
+       " 'GRE_std',\n",
+       " 'LOR_std',\n",
+       " 'LOR_std',\n",
+       " 'CGPA_std',\n",
+       " 'LOR_std',\n",
+       " 'LOR_std',\n",
+       " 'CGPA_std',\n",
+       " 'CGPA_std',\n",
+       " 'LOR_std',\n",
+       " 'CGPA_std',\n",
+       " 'CGPA_std',\n",
+       " 'GRE_std',\n",
+       " 'GRE_std',\n",
+       " 'GRE_std',\n",
+       " 'CGPA_std',\n",
+       " 'LOR_std',\n",
+       " 'GRE_std',\n",
+       " 'GRE_std',\n",
+       " 'LOR_std',\n",
+       " 'LOR_std',\n",
+       " 'GRE_std',\n",
+       " 'LOR_std',\n",
+       " 'GRE_std',\n",
+       " 'LOR_std',\n",
+       " 'CGPA_std',\n",
+       " 'CGPA_std',\n",
+       " 'GRE_std',\n",
+       " 'CGPA_std',\n",
+       " 'CGPA_std',\n",
+       " 'GRE_std',\n",
+       " 'GRE_std',\n",
+       " 'CGPA_std',\n",
+       " 'GRE_std',\n",
+       " 'GRE_std',\n",
+       " 'LOR_std',\n",
+       " 'GRE_std',\n",
+       " 'CGPA_std',\n",
+       " 'LOR_std',\n",
+       " 'GRE_std',\n",
+       " 'CGPA_std',\n",
+       " 'GRE_std',\n",
+       " 'LOR_std',\n",
+       " 'GRE_std',\n",
+       " 'LOR_std',\n",
+       " 'LOR_std',\n",
+       " 'LOR_std',\n",
+       " 'CGPA_std',\n",
+       " 'LOR_std',\n",
+       " 'LOR_std',\n",
+       " 'CGPA_std',\n",
+       " 'CGPA_std',\n",
+       " 'GRE_std',\n",
+       " 'LOR_std',\n",
+       " 'CGPA_std',\n",
+       " 'GRE_std',\n",
+       " 'CGPA_std',\n",
+       " 'CGPA_std',\n",
+       " 'LOR_std',\n",
+       " 'LOR_std',\n",
+       " 'GRE_std',\n",
+       " 'CGPA_std',\n",
+       " 'GRE_std',\n",
+       " 'LOR_std',\n",
+       " 'CGPA_std',\n",
+       " 'LOR_std',\n",
+       " 'CGPA_std',\n",
+       " 'CGPA_std',\n",
+       " 'CGPA_std']"
+      ]
+     },
+     "execution_count": 17,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
    "source": [
     "# Run this code:\n",
     "\n",
@@ -278,11 +2062,291 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 18,
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "data": {
+      "text/html": [
+       "<div>\n",
+       "<style scoped>\n",
+       "    .dataframe tbody tr th:only-of-type {\n",
+       "        vertical-align: middle;\n",
+       "    }\n",
+       "\n",
+       "    .dataframe tbody tr th {\n",
+       "        vertical-align: top;\n",
+       "    }\n",
+       "\n",
+       "    .dataframe thead th {\n",
+       "        text-align: right;\n",
+       "    }\n",
+       "</style>\n",
+       "<table border=\"1\" class=\"dataframe\">\n",
+       "  <thead>\n",
+       "    <tr style=\"text-align: right;\">\n",
+       "      <th></th>\n",
+       "      <th>GRE Score</th>\n",
+       "      <th>CGPA</th>\n",
+       "      <th>Serial No.</th>\n",
+       "      <th>TOEFL Score</th>\n",
+       "      <th>University Rating</th>\n",
+       "      <th>SOP</th>\n",
+       "      <th>LOR</th>\n",
+       "      <th>Research</th>\n",
+       "      <th>Chance of Admit</th>\n",
+       "      <th>CGPA_std</th>\n",
+       "      <th>GRE_std</th>\n",
+       "      <th>LOR_std</th>\n",
+       "      <th>decision_choice</th>\n",
+       "      <th>deciding_column</th>\n",
+       "    </tr>\n",
+       "  </thead>\n",
+       "  <tbody>\n",
+       "    <tr>\n",
+       "      <th>0</th>\n",
+       "      <td>337</td>\n",
+       "      <td>9.65</td>\n",
+       "      <td>1</td>\n",
+       "      <td>118</td>\n",
+       "      <td>4</td>\n",
+       "      <td>4.5</td>\n",
+       "      <td>4.5</td>\n",
+       "      <td>1</td>\n",
+       "      <td>0.92</td>\n",
+       "      <td>1.747900</td>\n",
+       "      <td>1.753381</td>\n",
+       "      <td>1.191647</td>\n",
+       "      <td>LOR_std</td>\n",
+       "      <td>1.191647</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>1</th>\n",
+       "      <td>316</td>\n",
+       "      <td>8.00</td>\n",
+       "      <td>2</td>\n",
+       "      <td>104</td>\n",
+       "      <td>3</td>\n",
+       "      <td>3.0</td>\n",
+       "      <td>3.5</td>\n",
+       "      <td>1</td>\n",
+       "      <td>0.72</td>\n",
+       "      <td>-0.991211</td>\n",
+       "      <td>-0.063367</td>\n",
+       "      <td>0.076740</td>\n",
+       "      <td>LOR_std</td>\n",
+       "      <td>0.076740</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>2</th>\n",
+       "      <td>322</td>\n",
+       "      <td>8.67</td>\n",
+       "      <td>3</td>\n",
+       "      <td>110</td>\n",
+       "      <td>3</td>\n",
+       "      <td>3.5</td>\n",
+       "      <td>2.5</td>\n",
+       "      <td>1</td>\n",
+       "      <td>0.80</td>\n",
+       "      <td>0.121034</td>\n",
+       "      <td>0.455704</td>\n",
+       "      <td>-1.038166</td>\n",
+       "      <td>GRE_std</td>\n",
+       "      <td>0.455704</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>3</th>\n",
+       "      <td>314</td>\n",
+       "      <td>8.21</td>\n",
+       "      <td>4</td>\n",
+       "      <td>103</td>\n",
+       "      <td>2</td>\n",
+       "      <td>2.0</td>\n",
+       "      <td>3.0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0.65</td>\n",
+       "      <td>-0.642597</td>\n",
+       "      <td>-0.236391</td>\n",
+       "      <td>-0.480713</td>\n",
+       "      <td>LOR_std</td>\n",
+       "      <td>-0.480713</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>4</th>\n",
+       "      <td>330</td>\n",
+       "      <td>9.34</td>\n",
+       "      <td>5</td>\n",
+       "      <td>115</td>\n",
+       "      <td>5</td>\n",
+       "      <td>4.5</td>\n",
+       "      <td>3.0</td>\n",
+       "      <td>1</td>\n",
+       "      <td>0.90</td>\n",
+       "      <td>1.233279</td>\n",
+       "      <td>1.147798</td>\n",
+       "      <td>-0.480713</td>\n",
+       "      <td>LOR_std</td>\n",
+       "      <td>-0.480713</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>...</th>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>380</th>\n",
+       "      <td>324</td>\n",
+       "      <td>9.04</td>\n",
+       "      <td>381</td>\n",
+       "      <td>110</td>\n",
+       "      <td>3</td>\n",
+       "      <td>3.5</td>\n",
+       "      <td>3.5</td>\n",
+       "      <td>1</td>\n",
+       "      <td>0.82</td>\n",
+       "      <td>0.735259</td>\n",
+       "      <td>0.628727</td>\n",
+       "      <td>0.076740</td>\n",
+       "      <td>CGPA_std</td>\n",
+       "      <td>0.735259</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>381</th>\n",
+       "      <td>325</td>\n",
+       "      <td>9.11</td>\n",
+       "      <td>382</td>\n",
+       "      <td>107</td>\n",
+       "      <td>3</td>\n",
+       "      <td>3.0</td>\n",
+       "      <td>3.5</td>\n",
+       "      <td>1</td>\n",
+       "      <td>0.84</td>\n",
+       "      <td>0.851463</td>\n",
+       "      <td>0.715239</td>\n",
+       "      <td>0.076740</td>\n",
+       "      <td>LOR_std</td>\n",
+       "      <td>0.076740</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>382</th>\n",
+       "      <td>330</td>\n",
+       "      <td>9.45</td>\n",
+       "      <td>383</td>\n",
+       "      <td>116</td>\n",
+       "      <td>4</td>\n",
+       "      <td>5.0</td>\n",
+       "      <td>4.5</td>\n",
+       "      <td>1</td>\n",
+       "      <td>0.91</td>\n",
+       "      <td>1.415886</td>\n",
+       "      <td>1.147798</td>\n",
+       "      <td>1.191647</td>\n",
+       "      <td>CGPA_std</td>\n",
+       "      <td>1.415886</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>383</th>\n",
+       "      <td>312</td>\n",
+       "      <td>8.78</td>\n",
+       "      <td>384</td>\n",
+       "      <td>103</td>\n",
+       "      <td>3</td>\n",
+       "      <td>3.5</td>\n",
+       "      <td>4.0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0.67</td>\n",
+       "      <td>0.303641</td>\n",
+       "      <td>-0.409414</td>\n",
+       "      <td>0.634193</td>\n",
+       "      <td>CGPA_std</td>\n",
+       "      <td>0.303641</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>384</th>\n",
+       "      <td>333</td>\n",
+       "      <td>9.66</td>\n",
+       "      <td>385</td>\n",
+       "      <td>117</td>\n",
+       "      <td>4</td>\n",
+       "      <td>5.0</td>\n",
+       "      <td>4.0</td>\n",
+       "      <td>1</td>\n",
+       "      <td>0.95</td>\n",
+       "      <td>1.764500</td>\n",
+       "      <td>1.407334</td>\n",
+       "      <td>0.634193</td>\n",
+       "      <td>CGPA_std</td>\n",
+       "      <td>1.764500</td>\n",
+       "    </tr>\n",
+       "  </tbody>\n",
+       "</table>\n",
+       "<p>385 rows × 14 columns</p>\n",
+       "</div>"
+      ],
+      "text/plain": [
+       "     GRE Score  CGPA  Serial No.  TOEFL Score  University Rating  SOP  LOR  \\\n",
+       "0          337  9.65           1          118                  4  4.5  4.5   \n",
+       "1          316  8.00           2          104                  3  3.0  3.5   \n",
+       "2          322  8.67           3          110                  3  3.5  2.5   \n",
+       "3          314  8.21           4          103                  2  2.0  3.0   \n",
+       "4          330  9.34           5          115                  5  4.5  3.0   \n",
+       "..         ...   ...         ...          ...                ...  ...  ...   \n",
+       "380        324  9.04         381          110                  3  3.5  3.5   \n",
+       "381        325  9.11         382          107                  3  3.0  3.5   \n",
+       "382        330  9.45         383          116                  4  5.0  4.5   \n",
+       "383        312  8.78         384          103                  3  3.5  4.0   \n",
+       "384        333  9.66         385          117                  4  5.0  4.0   \n",
+       "\n",
+       "     Research  Chance of Admit  CGPA_std   GRE_std   LOR_std decision_choice  \\\n",
+       "0           1             0.92  1.747900  1.753381  1.191647         LOR_std   \n",
+       "1           1             0.72 -0.991211 -0.063367  0.076740         LOR_std   \n",
+       "2           1             0.80  0.121034  0.455704 -1.038166         GRE_std   \n",
+       "3           0             0.65 -0.642597 -0.236391 -0.480713         LOR_std   \n",
+       "4           1             0.90  1.233279  1.147798 -0.480713         LOR_std   \n",
+       "..        ...              ...       ...       ...       ...             ...   \n",
+       "380         1             0.82  0.735259  0.628727  0.076740        CGPA_std   \n",
+       "381         1             0.84  0.851463  0.715239  0.076740         LOR_std   \n",
+       "382         1             0.91  1.415886  1.147798  1.191647        CGPA_std   \n",
+       "383         0             0.67  0.303641 -0.409414  0.634193        CGPA_std   \n",
+       "384         1             0.95  1.764500  1.407334  0.634193        CGPA_std   \n",
+       "\n",
+       "     deciding_column  \n",
+       "0           1.191647  \n",
+       "1           0.076740  \n",
+       "2           0.455704  \n",
+       "3          -0.480713  \n",
+       "4          -0.480713  \n",
+       "..               ...  \n",
+       "380         0.735259  \n",
+       "381         0.076740  \n",
+       "382         1.415886  \n",
+       "383         0.303641  \n",
+       "384         1.764500  \n",
+       "\n",
+       "[385 rows x 14 columns]"
+      ]
+     },
+     "execution_count": 18,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
    "source": [
-    "# Your code here:"
+    "admissions[\"decision_choice\"] = decision_choice\n",
+    "admissions[\"deciding_column\"] = admissions.apply(lambda row: row[row[\"decision_choice\"]], axis=1)\n",
+    "admissions"
    ]
   },
   {
@@ -294,11 +2358,303 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 17,
+   "execution_count": 19,
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "data": {
+      "text/html": [
+       "<div>\n",
+       "<style scoped>\n",
+       "    .dataframe tbody tr th:only-of-type {\n",
+       "        vertical-align: middle;\n",
+       "    }\n",
+       "\n",
+       "    .dataframe tbody tr th {\n",
+       "        vertical-align: top;\n",
+       "    }\n",
+       "\n",
+       "    .dataframe thead th {\n",
+       "        text-align: right;\n",
+       "    }\n",
+       "</style>\n",
+       "<table border=\"1\" class=\"dataframe\">\n",
+       "  <thead>\n",
+       "    <tr style=\"text-align: right;\">\n",
+       "      <th></th>\n",
+       "      <th>GRE Score</th>\n",
+       "      <th>CGPA</th>\n",
+       "      <th>Serial No.</th>\n",
+       "      <th>TOEFL Score</th>\n",
+       "      <th>University Rating</th>\n",
+       "      <th>SOP</th>\n",
+       "      <th>LOR</th>\n",
+       "      <th>Research</th>\n",
+       "      <th>Chance of Admit</th>\n",
+       "      <th>CGPA_std</th>\n",
+       "      <th>GRE_std</th>\n",
+       "      <th>LOR_std</th>\n",
+       "      <th>decision_choice</th>\n",
+       "      <th>deciding_column</th>\n",
+       "      <th>decision</th>\n",
+       "    </tr>\n",
+       "  </thead>\n",
+       "  <tbody>\n",
+       "    <tr>\n",
+       "      <th>0</th>\n",
+       "      <td>337</td>\n",
+       "      <td>9.65</td>\n",
+       "      <td>1</td>\n",
+       "      <td>118</td>\n",
+       "      <td>4</td>\n",
+       "      <td>4.5</td>\n",
+       "      <td>4.5</td>\n",
+       "      <td>1</td>\n",
+       "      <td>0.92</td>\n",
+       "      <td>1.747900</td>\n",
+       "      <td>1.753381</td>\n",
+       "      <td>1.191647</td>\n",
+       "      <td>LOR_std</td>\n",
+       "      <td>1.191647</td>\n",
+       "      <td>1</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>1</th>\n",
+       "      <td>316</td>\n",
+       "      <td>8.00</td>\n",
+       "      <td>2</td>\n",
+       "      <td>104</td>\n",
+       "      <td>3</td>\n",
+       "      <td>3.0</td>\n",
+       "      <td>3.5</td>\n",
+       "      <td>1</td>\n",
+       "      <td>0.72</td>\n",
+       "      <td>-0.991211</td>\n",
+       "      <td>-0.063367</td>\n",
+       "      <td>0.076740</td>\n",
+       "      <td>LOR_std</td>\n",
+       "      <td>0.076740</td>\n",
+       "      <td>0</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>2</th>\n",
+       "      <td>322</td>\n",
+       "      <td>8.67</td>\n",
+       "      <td>3</td>\n",
+       "      <td>110</td>\n",
+       "      <td>3</td>\n",
+       "      <td>3.5</td>\n",
+       "      <td>2.5</td>\n",
+       "      <td>1</td>\n",
+       "      <td>0.80</td>\n",
+       "      <td>0.121034</td>\n",
+       "      <td>0.455704</td>\n",
+       "      <td>-1.038166</td>\n",
+       "      <td>GRE_std</td>\n",
+       "      <td>0.455704</td>\n",
+       "      <td>0</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>3</th>\n",
+       "      <td>314</td>\n",
+       "      <td>8.21</td>\n",
+       "      <td>4</td>\n",
+       "      <td>103</td>\n",
+       "      <td>2</td>\n",
+       "      <td>2.0</td>\n",
+       "      <td>3.0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0.65</td>\n",
+       "      <td>-0.642597</td>\n",
+       "      <td>-0.236391</td>\n",
+       "      <td>-0.480713</td>\n",
+       "      <td>LOR_std</td>\n",
+       "      <td>-0.480713</td>\n",
+       "      <td>0</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>4</th>\n",
+       "      <td>330</td>\n",
+       "      <td>9.34</td>\n",
+       "      <td>5</td>\n",
+       "      <td>115</td>\n",
+       "      <td>5</td>\n",
+       "      <td>4.5</td>\n",
+       "      <td>3.0</td>\n",
+       "      <td>1</td>\n",
+       "      <td>0.90</td>\n",
+       "      <td>1.233279</td>\n",
+       "      <td>1.147798</td>\n",
+       "      <td>-0.480713</td>\n",
+       "      <td>LOR_std</td>\n",
+       "      <td>-0.480713</td>\n",
+       "      <td>0</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>...</th>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>380</th>\n",
+       "      <td>324</td>\n",
+       "      <td>9.04</td>\n",
+       "      <td>381</td>\n",
+       "      <td>110</td>\n",
+       "      <td>3</td>\n",
+       "      <td>3.5</td>\n",
+       "      <td>3.5</td>\n",
+       "      <td>1</td>\n",
+       "      <td>0.82</td>\n",
+       "      <td>0.735259</td>\n",
+       "      <td>0.628727</td>\n",
+       "      <td>0.076740</td>\n",
+       "      <td>CGPA_std</td>\n",
+       "      <td>0.735259</td>\n",
+       "      <td>0</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>381</th>\n",
+       "      <td>325</td>\n",
+       "      <td>9.11</td>\n",
+       "      <td>382</td>\n",
+       "      <td>107</td>\n",
+       "      <td>3</td>\n",
+       "      <td>3.0</td>\n",
+       "      <td>3.5</td>\n",
+       "      <td>1</td>\n",
+       "      <td>0.84</td>\n",
+       "      <td>0.851463</td>\n",
+       "      <td>0.715239</td>\n",
+       "      <td>0.076740</td>\n",
+       "      <td>LOR_std</td>\n",
+       "      <td>0.076740</td>\n",
+       "      <td>0</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>382</th>\n",
+       "      <td>330</td>\n",
+       "      <td>9.45</td>\n",
+       "      <td>383</td>\n",
+       "      <td>116</td>\n",
+       "      <td>4</td>\n",
+       "      <td>5.0</td>\n",
+       "      <td>4.5</td>\n",
+       "      <td>1</td>\n",
+       "      <td>0.91</td>\n",
+       "      <td>1.415886</td>\n",
+       "      <td>1.147798</td>\n",
+       "      <td>1.191647</td>\n",
+       "      <td>CGPA_std</td>\n",
+       "      <td>1.415886</td>\n",
+       "      <td>1</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>383</th>\n",
+       "      <td>312</td>\n",
+       "      <td>8.78</td>\n",
+       "      <td>384</td>\n",
+       "      <td>103</td>\n",
+       "      <td>3</td>\n",
+       "      <td>3.5</td>\n",
+       "      <td>4.0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0.67</td>\n",
+       "      <td>0.303641</td>\n",
+       "      <td>-0.409414</td>\n",
+       "      <td>0.634193</td>\n",
+       "      <td>CGPA_std</td>\n",
+       "      <td>0.303641</td>\n",
+       "      <td>0</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>384</th>\n",
+       "      <td>333</td>\n",
+       "      <td>9.66</td>\n",
+       "      <td>385</td>\n",
+       "      <td>117</td>\n",
+       "      <td>4</td>\n",
+       "      <td>5.0</td>\n",
+       "      <td>4.0</td>\n",
+       "      <td>1</td>\n",
+       "      <td>0.95</td>\n",
+       "      <td>1.764500</td>\n",
+       "      <td>1.407334</td>\n",
+       "      <td>0.634193</td>\n",
+       "      <td>CGPA_std</td>\n",
+       "      <td>1.764500</td>\n",
+       "      <td>1</td>\n",
+       "    </tr>\n",
+       "  </tbody>\n",
+       "</table>\n",
+       "<p>385 rows × 15 columns</p>\n",
+       "</div>"
+      ],
+      "text/plain": [
+       "     GRE Score  CGPA  Serial No.  TOEFL Score  University Rating  SOP  LOR  \\\n",
+       "0          337  9.65           1          118                  4  4.5  4.5   \n",
+       "1          316  8.00           2          104                  3  3.0  3.5   \n",
+       "2          322  8.67           3          110                  3  3.5  2.5   \n",
+       "3          314  8.21           4          103                  2  2.0  3.0   \n",
+       "4          330  9.34           5          115                  5  4.5  3.0   \n",
+       "..         ...   ...         ...          ...                ...  ...  ...   \n",
+       "380        324  9.04         381          110                  3  3.5  3.5   \n",
+       "381        325  9.11         382          107                  3  3.0  3.5   \n",
+       "382        330  9.45         383          116                  4  5.0  4.5   \n",
+       "383        312  8.78         384          103                  3  3.5  4.0   \n",
+       "384        333  9.66         385          117                  4  5.0  4.0   \n",
+       "\n",
+       "     Research  Chance of Admit  CGPA_std   GRE_std   LOR_std decision_choice  \\\n",
+       "0           1             0.92  1.747900  1.753381  1.191647         LOR_std   \n",
+       "1           1             0.72 -0.991211 -0.063367  0.076740         LOR_std   \n",
+       "2           1             0.80  0.121034  0.455704 -1.038166         GRE_std   \n",
+       "3           0             0.65 -0.642597 -0.236391 -0.480713         LOR_std   \n",
+       "4           1             0.90  1.233279  1.147798 -0.480713         LOR_std   \n",
+       "..        ...              ...       ...       ...       ...             ...   \n",
+       "380         1             0.82  0.735259  0.628727  0.076740        CGPA_std   \n",
+       "381         1             0.84  0.851463  0.715239  0.076740         LOR_std   \n",
+       "382         1             0.91  1.415886  1.147798  1.191647        CGPA_std   \n",
+       "383         0             0.67  0.303641 -0.409414  0.634193        CGPA_std   \n",
+       "384         1             0.95  1.764500  1.407334  0.634193        CGPA_std   \n",
+       "\n",
+       "     deciding_column  decision  \n",
+       "0           1.191647         1  \n",
+       "1           0.076740         0  \n",
+       "2           0.455704         0  \n",
+       "3          -0.480713         0  \n",
+       "4          -0.480713         0  \n",
+       "..               ...       ...  \n",
+       "380         0.735259         0  \n",
+       "381         0.076740         0  \n",
+       "382         1.415886         1  \n",
+       "383         0.303641         0  \n",
+       "384         1.764500         1  \n",
+       "\n",
+       "[385 rows x 15 columns]"
+      ]
+     },
+     "execution_count": 19,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
    "source": [
-    "# Your code here:"
+    "# Your code here:\n",
+    "admissions[\"decision\"] = np.where(admissions[\"deciding_column\"]>0.8,1,0)\n",
+    "admissions"
    ]
   },
   {
@@ -310,11 +2666,23 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 20,
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "85"
+      ]
+     },
+     "execution_count": 20,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
    "source": [
-    "# Your code here:"
+    "# Your code here:\n",
+    "admissions[\"decision\"].sum()"
    ]
   },
   {
@@ -330,11 +2698,315 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 21,
    "metadata": {},
    "outputs": [],
    "source": [
-    "# Your code here:"
+    "# Your code here:\n",
+    "\n",
+    "# remove everything that is not a letter or number\n",
+    "# replace space with underscores\n",
+    "# change upper case to lower case\n",
+    "admissions.columns = admissions.columns.str.lower().str.replace(r'[^A-Za-z0-9 _ ]', '', regex=True).str.replace(\" \", \"_\")"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 22,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/html": [
+       "<div>\n",
+       "<style scoped>\n",
+       "    .dataframe tbody tr th:only-of-type {\n",
+       "        vertical-align: middle;\n",
+       "    }\n",
+       "\n",
+       "    .dataframe tbody tr th {\n",
+       "        vertical-align: top;\n",
+       "    }\n",
+       "\n",
+       "    .dataframe thead th {\n",
+       "        text-align: right;\n",
+       "    }\n",
+       "</style>\n",
+       "<table border=\"1\" class=\"dataframe\">\n",
+       "  <thead>\n",
+       "    <tr style=\"text-align: right;\">\n",
+       "      <th></th>\n",
+       "      <th>gre_score</th>\n",
+       "      <th>cgpa</th>\n",
+       "      <th>serial_no</th>\n",
+       "      <th>toefl_score</th>\n",
+       "      <th>university_rating</th>\n",
+       "      <th>sop</th>\n",
+       "      <th>lor</th>\n",
+       "      <th>research</th>\n",
+       "      <th>chance_of_admit</th>\n",
+       "      <th>cgpa_std</th>\n",
+       "      <th>gre_std</th>\n",
+       "      <th>lor_std</th>\n",
+       "      <th>decision_choice</th>\n",
+       "      <th>deciding_column</th>\n",
+       "      <th>decision</th>\n",
+       "    </tr>\n",
+       "  </thead>\n",
+       "  <tbody>\n",
+       "    <tr>\n",
+       "      <th>0</th>\n",
+       "      <td>337</td>\n",
+       "      <td>9.65</td>\n",
+       "      <td>1</td>\n",
+       "      <td>118</td>\n",
+       "      <td>4</td>\n",
+       "      <td>4.5</td>\n",
+       "      <td>4.5</td>\n",
+       "      <td>1</td>\n",
+       "      <td>0.92</td>\n",
+       "      <td>1.747900</td>\n",
+       "      <td>1.753381</td>\n",
+       "      <td>1.191647</td>\n",
+       "      <td>LOR_std</td>\n",
+       "      <td>1.191647</td>\n",
+       "      <td>1</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>1</th>\n",
+       "      <td>316</td>\n",
+       "      <td>8.00</td>\n",
+       "      <td>2</td>\n",
+       "      <td>104</td>\n",
+       "      <td>3</td>\n",
+       "      <td>3.0</td>\n",
+       "      <td>3.5</td>\n",
+       "      <td>1</td>\n",
+       "      <td>0.72</td>\n",
+       "      <td>-0.991211</td>\n",
+       "      <td>-0.063367</td>\n",
+       "      <td>0.076740</td>\n",
+       "      <td>LOR_std</td>\n",
+       "      <td>0.076740</td>\n",
+       "      <td>0</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>2</th>\n",
+       "      <td>322</td>\n",
+       "      <td>8.67</td>\n",
+       "      <td>3</td>\n",
+       "      <td>110</td>\n",
+       "      <td>3</td>\n",
+       "      <td>3.5</td>\n",
+       "      <td>2.5</td>\n",
+       "      <td>1</td>\n",
+       "      <td>0.80</td>\n",
+       "      <td>0.121034</td>\n",
+       "      <td>0.455704</td>\n",
+       "      <td>-1.038166</td>\n",
+       "      <td>GRE_std</td>\n",
+       "      <td>0.455704</td>\n",
+       "      <td>0</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>3</th>\n",
+       "      <td>314</td>\n",
+       "      <td>8.21</td>\n",
+       "      <td>4</td>\n",
+       "      <td>103</td>\n",
+       "      <td>2</td>\n",
+       "      <td>2.0</td>\n",
+       "      <td>3.0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0.65</td>\n",
+       "      <td>-0.642597</td>\n",
+       "      <td>-0.236391</td>\n",
+       "      <td>-0.480713</td>\n",
+       "      <td>LOR_std</td>\n",
+       "      <td>-0.480713</td>\n",
+       "      <td>0</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>4</th>\n",
+       "      <td>330</td>\n",
+       "      <td>9.34</td>\n",
+       "      <td>5</td>\n",
+       "      <td>115</td>\n",
+       "      <td>5</td>\n",
+       "      <td>4.5</td>\n",
+       "      <td>3.0</td>\n",
+       "      <td>1</td>\n",
+       "      <td>0.90</td>\n",
+       "      <td>1.233279</td>\n",
+       "      <td>1.147798</td>\n",
+       "      <td>-0.480713</td>\n",
+       "      <td>LOR_std</td>\n",
+       "      <td>-0.480713</td>\n",
+       "      <td>0</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>...</th>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>380</th>\n",
+       "      <td>324</td>\n",
+       "      <td>9.04</td>\n",
+       "      <td>381</td>\n",
+       "      <td>110</td>\n",
+       "      <td>3</td>\n",
+       "      <td>3.5</td>\n",
+       "      <td>3.5</td>\n",
+       "      <td>1</td>\n",
+       "      <td>0.82</td>\n",
+       "      <td>0.735259</td>\n",
+       "      <td>0.628727</td>\n",
+       "      <td>0.076740</td>\n",
+       "      <td>CGPA_std</td>\n",
+       "      <td>0.735259</td>\n",
+       "      <td>0</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>381</th>\n",
+       "      <td>325</td>\n",
+       "      <td>9.11</td>\n",
+       "      <td>382</td>\n",
+       "      <td>107</td>\n",
+       "      <td>3</td>\n",
+       "      <td>3.0</td>\n",
+       "      <td>3.5</td>\n",
+       "      <td>1</td>\n",
+       "      <td>0.84</td>\n",
+       "      <td>0.851463</td>\n",
+       "      <td>0.715239</td>\n",
+       "      <td>0.076740</td>\n",
+       "      <td>LOR_std</td>\n",
+       "      <td>0.076740</td>\n",
+       "      <td>0</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>382</th>\n",
+       "      <td>330</td>\n",
+       "      <td>9.45</td>\n",
+       "      <td>383</td>\n",
+       "      <td>116</td>\n",
+       "      <td>4</td>\n",
+       "      <td>5.0</td>\n",
+       "      <td>4.5</td>\n",
+       "      <td>1</td>\n",
+       "      <td>0.91</td>\n",
+       "      <td>1.415886</td>\n",
+       "      <td>1.147798</td>\n",
+       "      <td>1.191647</td>\n",
+       "      <td>CGPA_std</td>\n",
+       "      <td>1.415886</td>\n",
+       "      <td>1</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>383</th>\n",
+       "      <td>312</td>\n",
+       "      <td>8.78</td>\n",
+       "      <td>384</td>\n",
+       "      <td>103</td>\n",
+       "      <td>3</td>\n",
+       "      <td>3.5</td>\n",
+       "      <td>4.0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0.67</td>\n",
+       "      <td>0.303641</td>\n",
+       "      <td>-0.409414</td>\n",
+       "      <td>0.634193</td>\n",
+       "      <td>CGPA_std</td>\n",
+       "      <td>0.303641</td>\n",
+       "      <td>0</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>384</th>\n",
+       "      <td>333</td>\n",
+       "      <td>9.66</td>\n",
+       "      <td>385</td>\n",
+       "      <td>117</td>\n",
+       "      <td>4</td>\n",
+       "      <td>5.0</td>\n",
+       "      <td>4.0</td>\n",
+       "      <td>1</td>\n",
+       "      <td>0.95</td>\n",
+       "      <td>1.764500</td>\n",
+       "      <td>1.407334</td>\n",
+       "      <td>0.634193</td>\n",
+       "      <td>CGPA_std</td>\n",
+       "      <td>1.764500</td>\n",
+       "      <td>1</td>\n",
+       "    </tr>\n",
+       "  </tbody>\n",
+       "</table>\n",
+       "<p>385 rows × 15 columns</p>\n",
+       "</div>"
+      ],
+      "text/plain": [
+       "     gre_score  cgpa  serial_no  toefl_score  university_rating  sop  lor  \\\n",
+       "0          337  9.65          1          118                  4  4.5  4.5   \n",
+       "1          316  8.00          2          104                  3  3.0  3.5   \n",
+       "2          322  8.67          3          110                  3  3.5  2.5   \n",
+       "3          314  8.21          4          103                  2  2.0  3.0   \n",
+       "4          330  9.34          5          115                  5  4.5  3.0   \n",
+       "..         ...   ...        ...          ...                ...  ...  ...   \n",
+       "380        324  9.04        381          110                  3  3.5  3.5   \n",
+       "381        325  9.11        382          107                  3  3.0  3.5   \n",
+       "382        330  9.45        383          116                  4  5.0  4.5   \n",
+       "383        312  8.78        384          103                  3  3.5  4.0   \n",
+       "384        333  9.66        385          117                  4  5.0  4.0   \n",
+       "\n",
+       "     research  chance_of_admit  cgpa_std   gre_std   lor_std decision_choice  \\\n",
+       "0           1             0.92  1.747900  1.753381  1.191647         LOR_std   \n",
+       "1           1             0.72 -0.991211 -0.063367  0.076740         LOR_std   \n",
+       "2           1             0.80  0.121034  0.455704 -1.038166         GRE_std   \n",
+       "3           0             0.65 -0.642597 -0.236391 -0.480713         LOR_std   \n",
+       "4           1             0.90  1.233279  1.147798 -0.480713         LOR_std   \n",
+       "..        ...              ...       ...       ...       ...             ...   \n",
+       "380         1             0.82  0.735259  0.628727  0.076740        CGPA_std   \n",
+       "381         1             0.84  0.851463  0.715239  0.076740         LOR_std   \n",
+       "382         1             0.91  1.415886  1.147798  1.191647        CGPA_std   \n",
+       "383         0             0.67  0.303641 -0.409414  0.634193        CGPA_std   \n",
+       "384         1             0.95  1.764500  1.407334  0.634193        CGPA_std   \n",
+       "\n",
+       "     deciding_column  decision  \n",
+       "0           1.191647         1  \n",
+       "1           0.076740         0  \n",
+       "2           0.455704         0  \n",
+       "3          -0.480713         0  \n",
+       "4          -0.480713         0  \n",
+       "..               ...       ...  \n",
+       "380         0.735259         0  \n",
+       "381         0.076740         0  \n",
+       "382         1.415886         1  \n",
+       "383         0.303641         0  \n",
+       "384         1.764500         1  \n",
+       "\n",
+       "[385 rows x 15 columns]"
+      ]
+     },
+     "execution_count": 22,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "admissions"
    ]
   },
   {
@@ -346,17 +3018,371 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 20,
+   "execution_count": 23,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "# Your code here:\n",
+    "admissions[\"gre_score\"] = np.where(admissions[\"gre_score\"]>4,admissions[\"gre_score\"]+10, admissions[\"gre_score\"])"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 24,
    "metadata": {},
    "outputs": [],
    "source": [
-    "# Your code here:"
+    "adjusted_gre = pd.cut(admissions[\"gre_score\"], bins=4)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 25,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "0      (337.5, 350.0]\n",
+       "1      (325.0, 337.5]\n",
+       "2      (325.0, 337.5]\n",
+       "3      (312.5, 325.0]\n",
+       "4      (337.5, 350.0]\n",
+       "            ...      \n",
+       "380    (325.0, 337.5]\n",
+       "381    (325.0, 337.5]\n",
+       "382    (337.5, 350.0]\n",
+       "383    (312.5, 325.0]\n",
+       "384    (337.5, 350.0]\n",
+       "Name: gre_score, Length: 385, dtype: category\n",
+       "Categories (4, interval[float64, right]): [(299.95, 312.5] < (312.5, 325.0] < (325.0, 337.5] < (337.5, 350.0]]"
+      ]
+     },
+     "execution_count": 25,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "adjusted_gre"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 26,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/html": [
+       "<div>\n",
+       "<style scoped>\n",
+       "    .dataframe tbody tr th:only-of-type {\n",
+       "        vertical-align: middle;\n",
+       "    }\n",
+       "\n",
+       "    .dataframe tbody tr th {\n",
+       "        vertical-align: top;\n",
+       "    }\n",
+       "\n",
+       "    .dataframe thead th {\n",
+       "        text-align: right;\n",
+       "    }\n",
+       "</style>\n",
+       "<table border=\"1\" class=\"dataframe\">\n",
+       "  <thead>\n",
+       "    <tr style=\"text-align: right;\">\n",
+       "      <th></th>\n",
+       "      <th>gre_score</th>\n",
+       "      <th>cgpa</th>\n",
+       "      <th>serial_no</th>\n",
+       "      <th>toefl_score</th>\n",
+       "      <th>university_rating</th>\n",
+       "      <th>sop</th>\n",
+       "      <th>lor</th>\n",
+       "      <th>research</th>\n",
+       "      <th>chance_of_admit</th>\n",
+       "      <th>cgpa_std</th>\n",
+       "      <th>gre_std</th>\n",
+       "      <th>lor_std</th>\n",
+       "      <th>decision_choice</th>\n",
+       "      <th>deciding_column</th>\n",
+       "      <th>decision</th>\n",
+       "      <th>gre_bins</th>\n",
+       "    </tr>\n",
+       "  </thead>\n",
+       "  <tbody>\n",
+       "    <tr>\n",
+       "      <th>0</th>\n",
+       "      <td>347</td>\n",
+       "      <td>9.65</td>\n",
+       "      <td>1</td>\n",
+       "      <td>118</td>\n",
+       "      <td>4</td>\n",
+       "      <td>4.5</td>\n",
+       "      <td>4.5</td>\n",
+       "      <td>1</td>\n",
+       "      <td>0.92</td>\n",
+       "      <td>1.747900</td>\n",
+       "      <td>1.753381</td>\n",
+       "      <td>1.191647</td>\n",
+       "      <td>LOR_std</td>\n",
+       "      <td>1.191647</td>\n",
+       "      <td>1</td>\n",
+       "      <td>(337.5, 350.0]</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>1</th>\n",
+       "      <td>326</td>\n",
+       "      <td>8.00</td>\n",
+       "      <td>2</td>\n",
+       "      <td>104</td>\n",
+       "      <td>3</td>\n",
+       "      <td>3.0</td>\n",
+       "      <td>3.5</td>\n",
+       "      <td>1</td>\n",
+       "      <td>0.72</td>\n",
+       "      <td>-0.991211</td>\n",
+       "      <td>-0.063367</td>\n",
+       "      <td>0.076740</td>\n",
+       "      <td>LOR_std</td>\n",
+       "      <td>0.076740</td>\n",
+       "      <td>0</td>\n",
+       "      <td>(325.0, 337.5]</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>2</th>\n",
+       "      <td>332</td>\n",
+       "      <td>8.67</td>\n",
+       "      <td>3</td>\n",
+       "      <td>110</td>\n",
+       "      <td>3</td>\n",
+       "      <td>3.5</td>\n",
+       "      <td>2.5</td>\n",
+       "      <td>1</td>\n",
+       "      <td>0.80</td>\n",
+       "      <td>0.121034</td>\n",
+       "      <td>0.455704</td>\n",
+       "      <td>-1.038166</td>\n",
+       "      <td>GRE_std</td>\n",
+       "      <td>0.455704</td>\n",
+       "      <td>0</td>\n",
+       "      <td>(325.0, 337.5]</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>3</th>\n",
+       "      <td>324</td>\n",
+       "      <td>8.21</td>\n",
+       "      <td>4</td>\n",
+       "      <td>103</td>\n",
+       "      <td>2</td>\n",
+       "      <td>2.0</td>\n",
+       "      <td>3.0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0.65</td>\n",
+       "      <td>-0.642597</td>\n",
+       "      <td>-0.236391</td>\n",
+       "      <td>-0.480713</td>\n",
+       "      <td>LOR_std</td>\n",
+       "      <td>-0.480713</td>\n",
+       "      <td>0</td>\n",
+       "      <td>(312.5, 325.0]</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>4</th>\n",
+       "      <td>340</td>\n",
+       "      <td>9.34</td>\n",
+       "      <td>5</td>\n",
+       "      <td>115</td>\n",
+       "      <td>5</td>\n",
+       "      <td>4.5</td>\n",
+       "      <td>3.0</td>\n",
+       "      <td>1</td>\n",
+       "      <td>0.90</td>\n",
+       "      <td>1.233279</td>\n",
+       "      <td>1.147798</td>\n",
+       "      <td>-0.480713</td>\n",
+       "      <td>LOR_std</td>\n",
+       "      <td>-0.480713</td>\n",
+       "      <td>0</td>\n",
+       "      <td>(337.5, 350.0]</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>...</th>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>380</th>\n",
+       "      <td>334</td>\n",
+       "      <td>9.04</td>\n",
+       "      <td>381</td>\n",
+       "      <td>110</td>\n",
+       "      <td>3</td>\n",
+       "      <td>3.5</td>\n",
+       "      <td>3.5</td>\n",
+       "      <td>1</td>\n",
+       "      <td>0.82</td>\n",
+       "      <td>0.735259</td>\n",
+       "      <td>0.628727</td>\n",
+       "      <td>0.076740</td>\n",
+       "      <td>CGPA_std</td>\n",
+       "      <td>0.735259</td>\n",
+       "      <td>0</td>\n",
+       "      <td>(325.0, 337.5]</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>381</th>\n",
+       "      <td>335</td>\n",
+       "      <td>9.11</td>\n",
+       "      <td>382</td>\n",
+       "      <td>107</td>\n",
+       "      <td>3</td>\n",
+       "      <td>3.0</td>\n",
+       "      <td>3.5</td>\n",
+       "      <td>1</td>\n",
+       "      <td>0.84</td>\n",
+       "      <td>0.851463</td>\n",
+       "      <td>0.715239</td>\n",
+       "      <td>0.076740</td>\n",
+       "      <td>LOR_std</td>\n",
+       "      <td>0.076740</td>\n",
+       "      <td>0</td>\n",
+       "      <td>(325.0, 337.5]</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>382</th>\n",
+       "      <td>340</td>\n",
+       "      <td>9.45</td>\n",
+       "      <td>383</td>\n",
+       "      <td>116</td>\n",
+       "      <td>4</td>\n",
+       "      <td>5.0</td>\n",
+       "      <td>4.5</td>\n",
+       "      <td>1</td>\n",
+       "      <td>0.91</td>\n",
+       "      <td>1.415886</td>\n",
+       "      <td>1.147798</td>\n",
+       "      <td>1.191647</td>\n",
+       "      <td>CGPA_std</td>\n",
+       "      <td>1.415886</td>\n",
+       "      <td>1</td>\n",
+       "      <td>(337.5, 350.0]</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>383</th>\n",
+       "      <td>322</td>\n",
+       "      <td>8.78</td>\n",
+       "      <td>384</td>\n",
+       "      <td>103</td>\n",
+       "      <td>3</td>\n",
+       "      <td>3.5</td>\n",
+       "      <td>4.0</td>\n",
+       "      <td>0</td>\n",
+       "      <td>0.67</td>\n",
+       "      <td>0.303641</td>\n",
+       "      <td>-0.409414</td>\n",
+       "      <td>0.634193</td>\n",
+       "      <td>CGPA_std</td>\n",
+       "      <td>0.303641</td>\n",
+       "      <td>0</td>\n",
+       "      <td>(312.5, 325.0]</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>384</th>\n",
+       "      <td>343</td>\n",
+       "      <td>9.66</td>\n",
+       "      <td>385</td>\n",
+       "      <td>117</td>\n",
+       "      <td>4</td>\n",
+       "      <td>5.0</td>\n",
+       "      <td>4.0</td>\n",
+       "      <td>1</td>\n",
+       "      <td>0.95</td>\n",
+       "      <td>1.764500</td>\n",
+       "      <td>1.407334</td>\n",
+       "      <td>0.634193</td>\n",
+       "      <td>CGPA_std</td>\n",
+       "      <td>1.764500</td>\n",
+       "      <td>1</td>\n",
+       "      <td>(337.5, 350.0]</td>\n",
+       "    </tr>\n",
+       "  </tbody>\n",
+       "</table>\n",
+       "<p>385 rows × 16 columns</p>\n",
+       "</div>"
+      ],
+      "text/plain": [
+       "     gre_score  cgpa  serial_no  toefl_score  university_rating  sop  lor  \\\n",
+       "0          347  9.65          1          118                  4  4.5  4.5   \n",
+       "1          326  8.00          2          104                  3  3.0  3.5   \n",
+       "2          332  8.67          3          110                  3  3.5  2.5   \n",
+       "3          324  8.21          4          103                  2  2.0  3.0   \n",
+       "4          340  9.34          5          115                  5  4.5  3.0   \n",
+       "..         ...   ...        ...          ...                ...  ...  ...   \n",
+       "380        334  9.04        381          110                  3  3.5  3.5   \n",
+       "381        335  9.11        382          107                  3  3.0  3.5   \n",
+       "382        340  9.45        383          116                  4  5.0  4.5   \n",
+       "383        322  8.78        384          103                  3  3.5  4.0   \n",
+       "384        343  9.66        385          117                  4  5.0  4.0   \n",
+       "\n",
+       "     research  chance_of_admit  cgpa_std   gre_std   lor_std decision_choice  \\\n",
+       "0           1             0.92  1.747900  1.753381  1.191647         LOR_std   \n",
+       "1           1             0.72 -0.991211 -0.063367  0.076740         LOR_std   \n",
+       "2           1             0.80  0.121034  0.455704 -1.038166         GRE_std   \n",
+       "3           0             0.65 -0.642597 -0.236391 -0.480713         LOR_std   \n",
+       "4           1             0.90  1.233279  1.147798 -0.480713         LOR_std   \n",
+       "..        ...              ...       ...       ...       ...             ...   \n",
+       "380         1             0.82  0.735259  0.628727  0.076740        CGPA_std   \n",
+       "381         1             0.84  0.851463  0.715239  0.076740         LOR_std   \n",
+       "382         1             0.91  1.415886  1.147798  1.191647        CGPA_std   \n",
+       "383         0             0.67  0.303641 -0.409414  0.634193        CGPA_std   \n",
+       "384         1             0.95  1.764500  1.407334  0.634193        CGPA_std   \n",
+       "\n",
+       "     deciding_column  decision        gre_bins  \n",
+       "0           1.191647         1  (337.5, 350.0]  \n",
+       "1           0.076740         0  (325.0, 337.5]  \n",
+       "2           0.455704         0  (325.0, 337.5]  \n",
+       "3          -0.480713         0  (312.5, 325.0]  \n",
+       "4          -0.480713         0  (337.5, 350.0]  \n",
+       "..               ...       ...             ...  \n",
+       "380         0.735259         0  (325.0, 337.5]  \n",
+       "381         0.076740         0  (325.0, 337.5]  \n",
+       "382         1.415886         1  (337.5, 350.0]  \n",
+       "383         0.303641         0  (312.5, 325.0]  \n",
+       "384         1.764500         1  (337.5, 350.0]  \n",
+       "\n",
+       "[385 rows x 16 columns]"
+      ]
+     },
+     "execution_count": 26,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "admissions[\"gre_bins\"] = adjusted_gre\n",
+    "admissions"
    ]
   }
  ],
  "metadata": {
   "kernelspec": {
-   "display_name": "Python 3",
+   "display_name": "datasci_env",
    "language": "python",
    "name": "python3"
   },
@@ -370,7 +3396,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.7.4"
+   "version": "3.8.20"
   }
  },
  "nbformat": 4,