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# Calculate standard deviation
def calculate_stdev(numbers):
   if len(numbers) == 0:
       return 0
   mean = sum(numbers) / len(numbers)
   variance = 0
   for num in numbers:
       variance += (num - mean) ** 2
   return variance ** 0.5

Compound Reviewer bot

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❌ Bug Found: Missing division by n in variance calculation

The variance calculation is missing the division by the number of elements, which will result in incorrect standard deviation values.

Fix:

variance += (num - mean) ** 2 variance = variance / len(numbers)

🔧 Tool Used: code execution

➡️ Input: calculate_std([2, 4, 6, 8, 10])

⬅️ Output: 2.83

💥 Impact: Correctly calculates standard deviation