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).
If Î¼ = E(X) is the expected value (mean) of the random variable X, then the variance is. That is, it is the expected value of the square of the deviation of X from its own mean. In plain language, it can be expressed as The average of the square of the distance of each data point from the mean. It is thus the mean squared deviation.