Charlie pays $84 for landscaping rocks for a project. The cost per pound is 50 cents. How many pounds did he purchase? (hint: 50 cents is written as 0.5) * 0.168
1.68
16.8
168

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