Calcolatore della Varianza — Formula

How to Calculate Variance

Formula (Population Variance)

σ² = Σ(xᵢ - μ)² / N

Steps

1. Find the mean (μ) 2. Subtract the mean from each value 3. Square each difference 4. Find the average of the squared differences

Variance is the square of the standard deviation.

Esempio Risolto

Find the variance of 4, 8, and 6.

  1. Mean = (4 + 8 + 6) / 3 = 6
  2. Squared differences: (4-6)² = 4, (8-6)² = 4, (6-6)² = 0
  3. Variance (population) = (4 + 4 + 0) / 3 = 2.6667
  4. Variance (sample) = (4 + 4 + 0) / 2 = 4