Variance
Computes variance as the mean of squared deviations from the mean.
Population variance
2,25
Population variance: divisor n (not sample n−1).
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Formula
population variance = Σ(x − μ)² / n — divisor n (not sample n−1)
Example: For 2, 4, 4, 4, 5, 5, 7, 9, population variance ≈ 4.0
Methodology
Population variance = Σ(x−μ)² / n - divisor n, not sample n−1.
Example
3, 5, 7: mean 5 → variance = 8/3 ≈ 2.67.