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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 a 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 might the assumption of independence be violated?

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

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