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Poisson distribution

Pronunciation: pwah-son[h]'


  1. a discontinuous distribution important in statistical work and defined by the equation p (x) = e -µµx/ x!, where e is the base of natural logarithms, x is the sequence of integers, µ is the mean, and x! represents the factorial of x.
  2. a distribution function used to describe the occurrence of rare events, or the sampling distribution of isolated counts in a continuum of time or space.
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