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The p.m.f. of a r.v. X is P(x)={{:((1)/(...

The p.m.f. of a r.v. X is `P(x)={{:((1)/(15)","x=1","2","…","15),(0", otherwise"):}`, then Var (X) =

A

`(248)/(3)`

B

`(28)/(3)`

C

`(224)/(3)`

D

`(56)/(3)`

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The correct Answer is:
D
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