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).
For a Discrete random variable, the variance Ï2 is calculated as: For a Continuous random variable, the variance Ï2 is calculated as: In both cases f(x) is the probability density function. The Standard Deviation Ï in both cases can be found by taking the square root of the variance.or a Discrete random variable, the variance Ï2 is calculated as: For a Continuous random variable, the variance Ï2 is calculated as: In both cases f(x) is the probability density function. The Standard Deviation Ï in both cases can be found by taking the square root of the variance.