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Let the p.m.f. ( probability mass functi...

Let the p.m.f. ( probability mass function ) of random variable x be
`P(x) = (4/x)(5/9)^(x)(4/x)^(4-x), x = 0, 1, 2, 3, 4`
= 0 , otherwise
Find E(x) and Var.(x)

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