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25 of the cables have failed after 12 years and 55 failed

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Reference no: EM13643479

25% of the cables have failed after 12 years and 55% failed after 16 years. If the distribution if normal, what is the mean life expectancy? What is the standard deviation of this distribution? Suppose the mean life expectancy is 15 years and the standard deviation is 3 years, what is he 99% reliability life?

Reference no: EM13643479

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