In poisson ratio mean and standard deviation are same
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For a Poisson Distribution
The standard deviation is always equal to the square root of the mean: . The exact probability that a Poisson random variable X with mean μ is equal to a is given by the formula. P X = a = μ a a !
Notation: Poisson(λ)
Mean: λ
Distribution: k=1,2,…
Parameter: λ>0
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