(Solution Library) If the life, in months, of a certain type of car battery is normally distributed with a mean of 73 months and a standard deviation of 9
Question: If the life, in months, of a certain type of car battery is normally distributed with a mean of 73 months and a standard deviation of 9 months, what should be the guarantee period if the company wants less than 5% of the batteries to fail while under warranty?
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