# Probability and Statistics

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**Probability and Statistics**as edited by DavidB4-bot (Talk | contribs) at 17:52, 13 July 2016. This URL is a permanent link to this version of this page.This article/section deals with mathematical concepts appropriate for late high school or early college. |

**Variance** is a measure in statistics of the dispersion of a set of values (represented as ). It is defined as

where the expected value of *X* is E(*X*).

The formula for variance must not be confused with the formula

which is the formula for a point estimate of the true variance from a sample of size *n*. As such this estimator itself has a variance which, as the formula indicates, decreases as the sample size increases.