Time: 0:00
Test a custom input to verify an edge case (e.g. empty lists, negative numbers, duplicates).
This bug belongs to the logic errors pattern
The wrong operator, an inverted condition, a formula the right way round but backwards.
What went wrong: / happens before +, just like in school maths. So a + b / 2 means a + (b / 2).
The fix: return (a + b) / 2
Remember: use brackets to say what should happen first.
The pattern behind it: logic errors.
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