The National Highway Traffic Safety Administration is interested in the effect of seat belt use on saving lives. The following table shows a report on children under the age of 5 who did not wear seat belts and were involved in motor vehicle accidents in which at least one fatality occurred between 1985 and 1989.

Ages Survivors Fatalities Age % in Report

0 45% 55% 14%

1 64% 36% 16%

2 71% 29% 23%

3 75% 25% 22%

4 77% 23% 25%

Find the conditional probability that a child is 3 years old given that he survived in an accident.

My answer:

I set the problem up to be P(child is 3 years old | he survived in an accident).

That equals P(child is 3 years old and survived in an accident)/P(survived in an accident).

The numerator equals 0.75, but I am having trouble figuring out what the denominator is. How do I find P(survived in an accident)?