What is the standard deviation of the distribution


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?

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Mechanical Engineering: What is the standard deviation of the distribution
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