A tine test is a common method used to determine whether a person has been exposed to tuberculosis. Approximately 5% of people in the United States have been exposed to tubercu- losis. Using the tine test, 98% of all people who have been exposed test positive, and 95% of those not exposed test negative. A person is randomly selected and given the tine test. Sup- pose that the test is positive; what is the probability that the person actually has been exposed?