#### 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(X^{2})

#### Solution

x | P(x) | xP(x) | x^{2}P(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.).