---
tag: 0WQNRCNY3M
kind: concept
name: Expected value
aliases: [expectation, mean, expected-value-of-random-variable, mathematical-expectation]
msc: [60A05]
sources:
  - url: https://en.wikipedia.org/wiki/Expected_value
    locator: lead section
same_as:
  wikidata: Q200125
  wikipedia: Expected value
---

## Summary

The expected value of a random variable is its average value, where each value has a weight equal to its probability.
The node [[expected value|0DCT0QZVQ1]] gives the precise definition.