If the team plans to change tires twice during a 500-mile


For a new type of? tire, a racing car team found the average distance a set of tires would run during a race is 168 ?miles, with a standard deviation of 15 miles. Assume that tire mileage is independent and follows a Normal model.

??a) If the team plans to change tires twice during a? 500-mile race, what is the expected value and standard deviation of miles remaining after two? changes?

?b) What is the probability they? won't have to change tires a third time before the end of a 500 mile? race?

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