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).
1 Variance is always measured in squared units. 2  xi{\displaystyle x_{i}} represents a term in your data set. â,  meaning sum, tells you to calculate the following terms for each value of xi{\displaystyle x_{i}}, then add them together.