The tread wear (in thousands of kilometers) that car owners get with a certain kind of tire

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The tread wear (in thousands of kilometers) that car owners get with a certain kind of tire is a random variable whose probability density is given by

Find the probabilities that one of these tires will last 

(a) At most 18,000 kilometers; 

(b) Anywhere from 27,000 to 36,000 kilometers; 

(c) At least 48,000 kilometers.

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