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poisson Definition

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poisson
noun(Pois-son 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 ... where μ is the mean and x takes on nonnegative integral values
poisson
noun(Pois-son distribution)
the ratio of transverse to longitudinal strain in a material under tension

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