---
tag: 0477R9PYAE
kind: concept
name: Variance
aliases: [variance-of-random-variable, second-central-moment]
msc: [60A05]
sources:
  - url: https://en.wikipedia.org/wiki/Variance
    locator: lead section
same_as:
  wikidata: Q175199
  wikipedia: Variance
---

## Summary

The variance of a random variable is the expected squared distance between the variable and its mean. It measures how widely the values spread around the mean.
The node [[variance|007QED3E0Y]] gives the precise definition.