---
tag: 0990W5PN13
kind: concept
name: Conditional probability
msc: [60A05]
sources:
  - url: https://en.wikipedia.org/wiki/Conditional_probability
    locator: lead section
same_as:
  wikidata: Q327069
  wikipedia: Conditional probability
---

## Summary

The conditional probability of an event $A$ given an event $B$ is the probability of $A$ when we know that $B$ has occurred.
It is written $P(A \mid B)$. The node [[conditional probability|0FJB06AD2P]] gives the precise definition.