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

(a) What is the probability of a fatal accident over a lifetime? Explain your reasoning carefully.
(b) Why might a driver be tempted not to use a seat belt "just on this trip"?

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a) One one trip, the probability of survival, P(survival) = 1 - 1/4,000,000 = 3,999,999/4,000,000

Therefore,the probability of survival on 50,000 trips is given as:
...

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