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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

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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

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