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 formula of population variance is sigma squared equals the sum of x minus the mean squared divided by n. I don't know about you, but that sounds and looks like Greek to me. So let's break this down into some more manageable steps. 1  Find the mean of the set of data. 2  Subtract each number from the mean.