diff --git a/Exercises_1.ipynb b/Exercises_1.ipynb
index 4a656d2..f1f6172 100644
--- a/Exercises_1.ipynb
+++ b/Exercises_1.ipynb
@@ -71,7 +71,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "# your code goes here\n"
+    sales['Customer_Age'].mean()
    ]
   },
   {