单词	Poisson distribution
释义	Poisson distribution noun Pois·​son distribution pwä-ˈsōⁿ-  : 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 {latex}f(x) = \\frac{e^{-\\mu}\\mu^{x}}{{x!}}{/latex} where μ is the mean and x takes on nonnegative integral values Word History Etymology Siméon D. Poisson †1840 French mathematician First Known Use 1922, in the meaning defined above
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