Suppose 500 athletes are tested for a drug, one in five has used the drug, the test has a 98% specificity and the test has a 100% sensitivity. That is, the probability of a false positive is 2% and there is no chance that the user of the drug will go undetected. If an athlete in the group tests positive, what is the probability that he or she has used the drug? Pr(used|POS) = (Type an integer or decimal rounded to the nearest hundredth as needed.) POS used NEG POS not used NEG