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).
In a population, variance is the average squared deviation from the population mean, as defined by the following formula: Ï 2 = Î£ ( X i - Î¼ ) 2 / N where Ï 2 is the population variance, Î¼ is the population mean, X i is the ith element from the population, and N is the number of elements in the population.