#### Related QuestionsVIEW ALL [5]

Find the expected value, variance and standard deviation of random variable X whose probability mass function (p.m.f.) is given below:

X=x | 1 | 2 | 3 |

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

The probability distribution of X, the number of defects per 10 metres of a fabric is given by

x | 0 | 1 | 2 | 3 | 4 |

P(X = x) | 0.45 | 0.35 | 0.15 | 0.03 | 0.02 |

Find the variance of X

Find the variance and standard deviation of the random variable X whose probability distribution is given below :

x | 0 | 1 | 2 | 3 |

P(X = x) | `1/8` | `3/8` | `3/8` | `1/8` |