Variance
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In probability theory and statistics, the variance is used as a measure of how far a set of numbers are spread out from each other. It is one of several descriptors of a probability distribution, describing how far the numbers lie from the mean (expected value). In particular, the variance is one of the moments of a distribution.
![{\displaystyle {Var}(X)={E}[(X-\mu )^{2}]}](https://wikimedia.org/api/rest_v1/media/math/render/svg/8868c29e0428eb4a4202a302b9a910cd79d521bb)
