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If P(X=x)=(x-5)/(4),x=5.5,6.5,7.5, then...

If `P(X=x)=(x-5)/(4),x=5.5,6.5,7.5,` then

A

f is a p.m.f.

B

f is not a p.m.f.

C

`underset(x_(i)=S)sumP(X=x)=1`

D

`underset(x_(i)=S)sumP(X=x)=(9)/(4)`

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The correct Answer is:
B
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