The probability mass function (p. m. f.) of X is given below : `|{:(X= – InterviewSolution

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1.	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(X^(2))`
Answer» `E(X^(2))=SigmaX^(2)P(X)` `E(X^(2))=1^(2)xx(1)/(5)+2^(2)xx(2)/(5)+3^(2)xx(2)/(5)` `=(1)/(5)+(8)/(8)+(18)/(5)=(27)/(5)`

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