Answer to Question #85446 in Statistics and Probability for kr

Question #85446

Let X be a discrete random variable having a pmf f(x) given by
f(x)={■((e^(-λ) λ^x)/x! , x=0,1,2,…@ 0 ,otherwise)┤
Show that f(x) is probability distribution and find the expected value (mean) of X.
(6 Marks)

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