What is the meaning of Samona? How popular is the baby name Samona? Learn the origin and popularity plus how to pronounce Samona
Variance. Variance (Ï 2) is a measure of the dispersion of a set of data points around their mean value. In other words, variance is a mathematical expectation of the average squared deviations from the mean. It is computed by finding the probability-weighted average of squared deviations from the expected value. Variance measures the variability from an average (volatility).
The standard deviation is the square root of the variance. The variance is an average of the squared deviations from the mean: s 2 = (x â x) â 2 n â1, where n is the sample sizeYou are probably wondering why we divide by n â1 in computing the average rather than by n. Here is an explanation.