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The probability is 1 in 4,000,000 that the single auto trip in United States will result in fatality. Over lifetime, an average U.S. driver takes 50,000 trips.

(a) Find out the probability of fatal accident over a lifetime? Describe your reasoning carefully. Hint: Suppose independent events. Why may the assumption of independence be violated?

 (b) Why might a driver be tempted not to employ a seat belt "just on this trip"?

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