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

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

A

`(49)/(36)`

B

`(98)/(251)`

C

`(216)/(251)`

D

`(294)/(251)`

Text Solution

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The correct Answer is:
D
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