Variance - Wikipedia
https://en.wikipedia.org/wiki/Variance
OverviewDefinitionExamplesPropertiesPropagationPopulation variance and sample varianceTests of equality of variancesMoment of inertiaIn probability theory and statistics, variance is the expected value of the squared deviation from the mean of a random variable. The standard deviation (SD) is obtained as the square root of the variance. Variance is a measure of dispersion, meaning it is a measure of how far a set of numbers is spread out from their average value. It is the second central moment of a distribution, and the covariance
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