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9. The mileage (in thousands of miles) that car owners get with a certain kind of radial tire is a random variable having an exponential

9. The mileage (in thousands of miles) that car owners get with a certain kind of radial tire is a random variable having an exponential distribution with 6 = 40. Find the probabllitles that one of these tires will last (a) at least 20,000 miles; (b) at most 30,000 miles

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