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Question - Probability Distribution - Probability Mass Function (P.M.F.)

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Question

Let the p. m. f. (probability mass function) of random variable x be

`p(x)=(4/x)(5/9)^x(4/9)^(4-x), x=0, 1, 2, 3, 4`

                                                =0 otherwise

find E(x) and var (x)

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