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 mainly used to calculate the standard deviation and other statistics. There are four steps to calculate the variance: 1  Find the mean of the data set. 2  Subtract the mean from each value in the data set. 3  Square each of the values so that you now have all positive values, then add the squared values together.