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 Variance is: Var(X) = Î£x2p â Î¼2. To calculate the Variance 1  : square each value and multiply by its probability. 2  sum them up and we get Î£x2p. 3  then subtract the square of the Expected Value Î¼2.