Question
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`
Is there an error in this question or solution?
APPEARS IN
Solution The Probability Mass Function (P.M.F.) of X is Given Below Concept: Probability Distribution - Probability Mass Function (P.M.F.).
