Probability Notation

Notation for Probability

And

, refers to ‘and’.

Ex: P(student, athlete) is the probability that you are a student and an athlete.

Given that/conditional on

| refers to ‘given that’ or ‘conditional on’.

Ex: $P(\text{drank last weekend}|\text{fraternity member})$ is the probability that you drank last week given you are a fraternity member.