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Pois·son distribution | \ pwä-ˈsōⁿ- 
\
\Definition of Poisson distribution
: a probability density function that is often used as a mathematical model of the number of outcomes obtained in a suitable interval of time and space, that has its mean equal to its variance, that is used as an approximation to the binomial distribution, and that has the form {latex}f(x) = \frac{e^{-\mu}\mu^{x}}{{x!}}{/latex} where μ is the mean and x takes on nonnegative integral values
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Time Traveler for Poisson distribution
The first known use of Poisson distribution was in 1922
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