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OpenStudy (anonymous):
Mean lifetime of a wristwatch is 25 months, with a standard deviation of 5 months. If the distribution is normal, for how many months should a guarantee be made if the manufacturer does not want to exchange more than 10% of watches? Just want to make sure I'm doing the process right. The answer is 23.75 months, correct? That's from (-0.25*5) + 25
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