# The Probability Mass Function (P.M.F.) of X is Given Below - Mathematics and Statistics

The probability mass function (p.m.f.) of X is given below:

 X=x 1 2 3 P (X= x) 1/5 2/5 2/5

find E(X2)

#### Solution

 x P(x) xP(x) x2P(x) 1 1/5 1/5 1/5 2 2/5 4/5 8/5 3 2/5 6/5 18/5 sumx^2P(x)=27/5

E(x^2)=sum x^2P(x)=27/5

Concept: Probability Distribution - Probability Mass Function (P.M.F.)
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