diff --git a/your-code/main.ipynb b/your-code/main.ipynb
index 332f496..b46dbc1 100644
--- a/your-code/main.ipynb
+++ b/your-code/main.ipynb
@@ -9,11 +9,13 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 13,
    "metadata": {},
    "outputs": [],
    "source": [
-    "# Libraries"
+    "import numpy as np\n",
+    "import matplotlib.pyplot as plt\n",
+    "import scipy.stats as st"
    ]
   },
   {
@@ -32,11 +34,29 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 12,
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "(172.14308590115726, 174.79024743217607)"
+      ]
+     },
+     "execution_count": 12,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
    "source": [
-    "# your code here"
+    "# your code here\n",
+    "# your code here\n",
+    "heights = [167, 167, 168, 168, 168, 169, 171, 172, 173, 175, 175, 175, 177, 182, 195]\n",
+    "std = 4 # of the population\n",
+    "mean = sum(heights)/len(heights)\n",
+    "mean\n",
+    "n = len(heights)\n",
+    "st.norm.interval(0.80,loc=mean,scale=std/np.sqrt(n))"
    ]
   },
   {
@@ -51,11 +71,39 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 11,
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "(0.20248138545542083, 0.3118043288302934)\n",
+      "(0.18698561776452813, 0.3273000965211861)\n"
+     ]
+    }
+   ],
    "source": [
-    "# your code here"
+    "# your code here\n",
+    "sample_proportion = 27 / 105\n",
+    "\n",
+    "confidence_80 = 0.80\n",
+    "confidence_90 = 0.90\n",
+    "\n",
+    "standard_error = np.sqrt((sample_proportion * (1 - sample_proportion)) / 105)\n",
+    "\n",
+    "z_score_80 = st.norm.ppf((1 + confidence_80) / 2)\n",
+    "z_score_90 = st.norm.ppf((1 + confidence_90) / 2)\n",
+    "\n",
+    "margin_of_error_80 = z_score_80 * standard_error\n",
+    "margin_of_error_90 = z_score_90 * standard_error\n",
+    "\n",
+    "confidence_interval_80 = (sample_proportion - margin_of_error_80, sample_proportion + margin_of_error_80)\n",
+    "confidence_interval_90 = (sample_proportion - margin_of_error_90, sample_proportion + margin_of_error_90)\n",
+    "\n",
+    "\n",
+    "print(confidence_interval_80)\n",
+    "print(confidence_interval_90)"
    ]
   },
   {
@@ -131,7 +179,7 @@
  ],
  "metadata": {
   "kernelspec": {
-   "display_name": "Python 3",
+   "display_name": "Python 3 (ipykernel)",
    "language": "python",
    "name": "python3"
   },
@@ -145,7 +193,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.7.3"
+   "version": "3.11.4"
   }
  },
  "nbformat": 4,