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The mileage (in 1,000s of miles) that car owners get with a certain kind of radial...

The mileage (in 1,000s of miles) that car owners get with a certain kind of radial tire is a random variable having an exponential distribution with a mean of 50. a. What is the probability that a tire will last at most 40,000 miles? (Round intermediate calculations to at least 4 decimal places and final answer to 4 decimal places.) b. What is the probability that a tire will last at least 65,000 miles? (Round intermediate calculations to at least 4 decimal places and final answer to 4 decimal places.)

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