Poisson distribution is a simple probability model in statistics. It describes a random events in a certain time or space. For example, the chance to meet a deer when you are driving in an highway of a forest area is a poisson distribution event.

Poisson Distribution Probability Formula:
   P = e^-λλⁿ/n!

Where:

   P: Poisson Distribution Probability
   λ: Average Events per Unit Time
   n: Number of Events