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The p.m.f. of a r.v X is P(x)={{:(kx","x...

The p.m.f. of a r.v X is `P(x)={{:(kx","x=1","2","3),(0", otherwise"):}`, then Var (X) =

A

`(25)/(81)`

B

`(25)/(36)`

C

`(5)/(9)`

D

`(5)/(6)`

Text Solution

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The correct Answer is:
C
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