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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

`1/4`

B

`1/5`

C

`1/6`

D

`1/7`

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The correct Answer is:
D
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