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The life expectancy of a particular brand of tire is normally distributed with a mean of 40,000 and a standard deviation of 5,000 miles

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The life expectancy of a particular brand of tire is normally distributed with a mean of 40,000 and a standard deviation of 5,000 miles.

a) What is the probability that randomly selected tire will have a life of no more than 50,000 miles?

b) What is the probability that a randomly selected tire will have a life of exactly 47,500 miles?