diff --git a/module2/exo2/exercice.ipynb b/module2/exo2/exercice.ipynb
index 4be9e30b7b2fc89da15d186196841109253bd074..0c730123bd013cd0973452f1c0de91eda6983ec1 100644
--- a/module2/exo2/exercice.ipynb
+++ b/module2/exo2/exercice.ipynb
@@ -345,16 +345,16 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 49,
+   "execution_count": 50,
    "metadata": {},
    "outputs": [
     {
      "data": {
       "text/plain": [
-       "18.784374747474743"
+       "4.334094455301447"
       ]
      },
-     "execution_count": 49,
+     "execution_count": 50,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -365,7 +365,7 @@
     "\n",
     "df = pd.Series(list)\n",
     "df.describe()\n",
-    "df.std()**2"
+    "df.std()"
    ]
   },
   {