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The life span of a car tire, calculated in miles, is normally distributed. with a mean of 80,000 miles and a standard deviation of 6,000

The life span of a car tire, calculated in miles, is normally distributed. with a mean of 80,000 miles and a standard deviation of 6,000 miles It the ure manutacturer wants to ensure that less than 4% ot all tires fail under warranty ,how many miles should each tire be guaranteed

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