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If p.m.f. of a d.r.v. X is P (X = x) = ...

If p.m.f. of a d.r.v. X is ` P (X = x) = ((""^(5)C_(x)))/(2^(5)) , "for " x = 0, 1, 2, 3, 4, 5 ` and = 0 otherwise . If ` a = P ( X le 2) and b = P ( X ge 3)` , then E (X) =

A

` a lt b `

B

` a gt b`

C

` a = b`

D

` a + b`

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The correct Answer is:
C
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