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Poission Distribution

Poission’s distribution is related to probabilities of events which are extremely rare but have large number of individual chances to occur. E.g.- number of persons die by dog-bite in a city. The number of trials n is taken very large and chance of P is taken every small taking np constant.

Probability of
 r successes, P(r) = 560.png

 m = np (constant)

 = mean, variance

standard deviation =

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