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Statistics - Probability

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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
f(x) = ( (1/30)e-x/30 for x > 0
0 for x < 0}

What tread wear can a car owner expects to get with one of the tires?
(Could you explain the integration by part section that is need for this problem?)

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Solution Summary

The probability of trend wear is examined. A complete, neat and step-by-step solution is provided.

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