A drug test for athletes has a 6% false positive rate and a 10% false negative rate. Of the athletes tested, 4% have actually been using the prohibited drug. Now, in keeping with the notation that we are familiar with, think of A = event that the drug test is positive, and B = event that the drug is actually taken. If a sample of athletes test positive, what is the probability that a randomly chosen athlete from this sample has actually been using the prohibited drug?

a. 0.489
b. 0.168
c. 0.385
d. 0.761

Kevin has a spinner that has 10 equal sections and 2 sections of each color—red, blue, green, yellow, and purple. kevin spins the spinner 180 times. kevin determines about how many times the spinner will land on red or green, and his work is shown below. -kevin has the formula reversed; it should be the total number of sections over the number of red or green sections. -kevin should have used a 4 in the numerator because there are 2 red sections and 2 green sections. -kevin should multiply by the number of sections in the spinner rather than the total number of spins. -kevin calculated the prediction correctly and did not make any mistakes.