Question

A survey of the 12th grade students at Gaffigan High School found that 84% of the seniors have their driver’s licenses, 16% of seniors take the bus every day to school, and 14% of the seniors have driver’s licenses and take the bus to school every day.

To the nearest whole percent, what is the probability that a senior takes the bus to school every day, given that he or she has a driver’s license?

17%
19%
36%
70%

Answer 1

We want P(bus | license) = P(bus and license) / P(license) = 14% / 84% = 1/6 ≈ 0.1667 ≈ 17%.

Answer: 17%.