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).
To calculate the population standard deviation, first compute the difference of each data point from the mean, and square the result of each: Next compute the average of these values, and take the square root: This quantity is the population standard deviation; it is equal to the square root of the variance.