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The p.m.f. of a r.v. X is P(x)={{:((3-x)...

The p.m.f. of a r.v. X is `P(x)={{:((3-x)/(10)","x=-1","0","1","2),(0", otherwise"):}` then E (X) =

A

`0.4`

B

`-0.4`

C

0

D

`-0.2`

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The correct Answer is:
C
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