diff --git a/module2/exo2/exercice.ipynb b/module2/exo2/exercice 2 partie 2.ipynb
similarity index 97%
rename from module2/exo2/exercice.ipynb
rename to module2/exo2/exercice 2 partie 2.ipynb
index 0441e28f5f62fc20dd8ba0358676c6676be9e36f..9fcbacc3f4fb053de3d7e9f5fbc34761fa13012e 100644
--- a/module2/exo2/exercice.ipynb
+++ b/module2/exo2/exercice 2 partie 2.ipynb	
@@ -124,22 +124,22 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 15,
+   "execution_count": 18,
    "metadata": {},
    "outputs": [
     {
      "data": {
       "text/plain": [
-       "4.312369534258399"
+       "4.334094455301447"
       ]
      },
-     "execution_count": 15,
+     "execution_count": 18,
      "metadata": {},
      "output_type": "execute_result"
     }
    ],
    "source": [
-    "std = np.std(data)\n",
+    "std = np.std(data, ddof=1)\n",
     "std"
    ]
   },
diff --git a/module2/exo3/exercice.ipynb b/module2/exo3/exercice 2 partie 3.ipynb
similarity index 100%
rename from module2/exo3/exercice.ipynb
rename to module2/exo3/exercice 2 partie 3.ipynb