Standard Deviation Formula

Standard deviation (σ) is the measure of spread of numbers from the mean value in a given set of data. Sample SD formula is S = √∑ (X - M)2 / n - 1. Population SD formula is S = √∑ (X - M)2 / n. Mean(M) can be calculated by adding the X values divide by the Number of values (N).

Sample/Population Standard Deviation Formula

Formula :

Mean :
Mean = Sum of X values / N(Number of Values)

Variance :
Variance = s2

Sample Standard Deviation :
Standard Deviation Formula
Population SD :
Population Standard Deviation Formula

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