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he top-selling Red and Voss tire is rated 60000 miles, which means nothing. In fact, the distance the tires can run until wear-out is a normally distributed random variable with

a mean of 74000 miles and a standard deviation of 6000 miles. What is the probability that the tire wears out before 60000 miles? B. What is the probability that a tire lasts more than 81000 miles?

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