# probability problem

posted by
**mt**
.

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. Hint: Assume 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”?