A certain type of engines lasts, on average, 5 years with a standard deviation of 1.2...

 

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A certain type of engines lasts, on average, 5 years with a standard deviation of 1.2 years. Assuming that the engine ifelimes an normat distributed, the probability that a given machine will last more than 4.5 years is O 0.1628 0.6628 0.3372 A certain type of engines lasts, on average, 5 years with a standard deviation of 1.2 years. Assuming that the engine ifelimes an normat distributed, the probability that a given machine will last more than 4.5 years is O 0.1628 0.6628 0.3372