Question: a flashlight battery is guaranteed to last 40 hours .tests indicate that the length of life of these batteries is normally distributed with mean 50

a flashlight battery is guaranteed to last 40 hours .tests indicate that the length of life of these batteries is normally distributed with mean 50 and variance 16. find the probability that the life of the battery exceeds 60 hours, is between 40 and 60 hours and wat % of batteries will fail to meet the guarantee

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