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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Let me Go over it. and ill Give you a Yes or no. One sec @DurableToaster

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