47. Ann is stocking up on boxes of cereal. If they are on sale for $2.25 each and she has a $2 coupon, and she wishes to spend a maximum of $20 on cereal, how many boxes can she buy?

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