Question

What is the joint probability of two mutually exclusive events?

Answer 1

Mutually exclusive events mean two events can not happen at the same time.

Joint probability means the probability of an occurrence of two or more events at the same time.

If events $A$ and $B$ are mutually exclusive, then $P\left(A\cap B\right)=0$

Also $P\left(A\cap B\right)$ is the joint probability of the events.

Hence, the joint probability of two mutually exclusive events is always $0$.