Calculatrice de Variance Gratuite
Calculez la variance d'un jeu de données. Mesurez la dispersion statistique de vos valeurs par rapport à la moyenne.
Variance Pop
2.666667
Variance Sample4.000000
Écart type1.632993
Moyenne6.0000
Formule
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.
Exemple Résolu
Find the variance of 4, 8, and 6.
- 01Mean = (4 + 8 + 6) / 3 = 6
- 02Squared differences: (4-6)² = 4, (8-6)² = 4, (6-6)² = 0
- 03Variance (population) = (4 + 4 + 0) / 3 = 2.6667
- 04Variance (sample) = (4 + 4 + 0) / 2 = 4
Questions Fréquentes
What is variance?
Variance measures how far a set of numbers is spread out from their average value. It is the average of the squared differences from the mean.
Why do we square the differences?
Squaring removes negative signs (so deviations above and below the mean don't cancel out) and gives more weight to larger deviations.
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