# Conditional Probability

Conditional probability is the probability of an event, assuming that some other event has already occurred.

Conditional probability is a high school-level concept that would be first encountered in a probability and statistics course. It is an Advanced Placement Statistics topic and is listed in the California State Standards for Probability and Statistics.

### Prerequisites

Probability: | Probability is the branch of mathematics that studies the possible outcomes of given events together with the outcomes' relative likelihoods and distributions. |