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The mean lifetime of a wristwatch is 25 months, with a standard deviation of 5 months. If the distribution is normal, for how many months

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The 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 gurantee be if the manufacturer does not want to exchange more than 10% of the watches? Assume the variable is normally distributed

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