The probability is 1 in 4,000,000 that a single auto trip in United States will result in fatality. Over a lifetime, an average U.S. driver takes 50,000 trips.
(a) Determine 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 use a seat belt "just on this trip"?