Named after French mathematician Siméon Denis Poisson
Details
Expresses the probability of the number-of-events occurring in a fixed-interval of time or space
Provided
Events occur with a known constant mean rate
Events occur independently of the time since the last event
Example
Births in a hospital occur randomly at an average rate of 1.8 births per hour. What is the probability of observing 4 births in a given hour at the hospital?