Mia's school took a field trip to an amusement park. There were 238 students on the trip. A total of 145 students rode the water rides. Of those, 53 students also rode the Ferris wheel. Eight students did not ride any water rides or the Ferris wheel. How many students rode the Ferris wheel, but not the water rides? Show your work

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