"poisson" is a fish.
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Given a Poisson distribution with mean = 2. Find P(X < 5)
The mean and variance are equal in the Poisson distribution. The mean and std deviation would be equal only for the case of mean = 1. See related link.
The exponential distribution and the Poisson distribution.
For elastic, isotropic and homogeneous materials, zero Poisson's ratio means that the material doesn't present lateral deformation on bending, compressing or extending.
0.567