A radio station runs a promotion at an auto show with a money box with 15 5100 tickets, 13 550 tickets, and 12 525 tickets. The box contains an additional 20 "dummy tickets with no value. Three tickets are randomly drawn Find the probability that all three tickets have no value.
The probability that all three tickets drawn have no money value is…..

Suppose that 3% of all athletes are using the endurance-enhancing hormone epo (you should be able to simply compute the percentage of all athletes that are not using epo). for our purposes, a “positive” test result is one that indicates presence of epo in an athlete’s bloodstream. the probability of a positive result, given the presence of epo is .99. the probability of a negative result, when epo is not present, is .90. what is the probability that a randomly selected athlete tests positive for epo? 0.0297