Question

In terms of the parameters of the probability mass function, what is the formula for the standard deviation of a Poisson distribution?

Answer 1

f (x ) = `e ^- m` `m ^x` / x !, x = 0, 1, 2 ... `oo` is the p.d.f. of Poisson distribution. Its variance is 'm' , the parameter in the p.d.f. and hence S.D = `sqrt`m.