Suppose you have data that shows that 12% of athletes test positive for steroids. You also know that 11% of athletes test positive for steroids and actually use steroids. What is the probability that an athlete uses steroids, given that he tests positive?.

The problem ask for the probability that an athlete uses steroid, given that the test is positive if 12% athletes use steroid and the positive that uses steriod is 11% and the answer would be 0.67%, I hope you are satisfied with my asnwer and feel free to ask for more