diff --git a/Solutions.ipynb b/Solutions.ipynb
index b3e2431..f2089a2 100644
--- a/Solutions.ipynb
+++ b/Solutions.ipynb
@@ -33,12 +33,13 @@
    ]
   },
   {
-   "cell_type": "code",
-   "execution_count": null,
-   "id": "39c6f717",
+   "cell_type": "markdown",
+   "id": "eac7b071",
    "metadata": {},
-   "outputs": [],
-   "source": []
+   "source": [
+    "H₀: the mean systolic blood pressure of the Honolulu sample is significantly different from the population mean\\\n",
+    "H₁: the mean systolic blood pressure of the Honolulu sample is not significantly different from the population mean"
+   ]
   },
   {
    "cell_type": "markdown",
@@ -49,12 +50,12 @@
    ]
   },
   {
-   "cell_type": "code",
-   "execution_count": null,
-   "id": "b09ce149",
+   "cell_type": "markdown",
+   "id": "2abffa55",
    "metadata": {},
-   "outputs": [],
-   "source": []
+   "source": [
+    "Not clear what to do here."
+   ]
   },
   {
    "cell_type": "markdown",
@@ -66,11 +67,47 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 2,
    "id": "97f73e20",
    "metadata": {},
-   "outputs": [],
-   "source": []
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Statistic is:  4.761904761904759\n"
+     ]
+    }
+   ],
+   "source": [
+    "sample_mean = 130.1\n",
+    "pop_mean = 120\n",
+    "sample_std = 21.21\n",
+    "n = 100\n",
+    "statistic = (130.1 - 120)/(21.21/(n**0.5))\n",
+    "print(\"Statistic is: \", statistic)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 3,
+   "id": "9f287f12",
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Statistic is:  4.761904761904759\n"
+     ]
+    }
+   ],
+   "source": [
+    "import math\n",
+    "\n",
+    "statistic = (sample_mean - pop_mean)/(sample_std/math.sqrt(n))\n",
+    "print(\"Statistic is: \", statistic)"
+   ]
   },
   {
    "cell_type": "markdown",
@@ -97,7 +134,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.8.5"
+   "version": "3.8.8"
   }
  },
  "nbformat": 4,