Variance calculation produces negative

Code reviewCode quality & reviewSenior–Staff~30 min

Review this Java single-pass variance.

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1double variance(double[] xs) {

2 double sum = 0, sumSq = 0;

3 for (double x : xs) { sum += x; sumSq += x * x; }

4 int n = xs.length;

5 double mean = sum / n;

6 return sumSq / n - mean * mean;

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