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प्रश्न
Define Poisson distribution
उत्तर
Poisson distribution was derived in 1837 by a French Mathematician Simeon D. Poisson.
A random variable X is said to follow a poisson distribution with parameter X if it assumes only non-negative values and its probability mass function is given by
`"P"(x, lambda) = "P"("X" = x) = {{:(("e"^(-lambda) lambda^x)/(x!), x = 0"," 1"," 2"," ......; lambda > 0),(0, "otherwise"):}`
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