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A certain component is critical to the operation of an electrical system and must be...

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A certain component is critical to the operation of an electrical system and must be replaced immediately upon failure If the mean life of this type of component is 80 hours and its standard deviation is 28 hours find the minimum number of these components to stock so that the probability that the system is in continual operation for the next 2000 hours is at least 0 95

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