CK-12 Probability and Statistics - Advanced

4.5. The Poisson Probability Distribution http://www.ck12.org

p(x) =

λxe−λ

x!

x= 0 , 1 , 2 , 3 ,...

μ=λ

σ^2 =λ

where

λ=The mean number of events during the time, distance, volume or area.

e=the base of the natural logarithm= 2. 718281828 ...