diff --git a/calculate_average b/calculate_average
new file mode 100644
index 00000000..65052b4e
--- /dev/null
+++ b/calculate_average
@@ -0,0 +1,11 @@
+def calculate_average(numbers):
+    total = 0
+    for number in numbers:
+        total += number
+    # 小bug: 错误地使用了整数除法，这在Python 3中会导致精度丢失
+    average = total // len(numbers)
+    return average
+
+# 示例
+numbers = [10, 20, 30, 40, 50]
+print(f"Average: {calculate_average(numbers)}")