You are responsible for the hamburger rolls for an upcoming picnic. each bag of rolls cost $1.30 and contains 8 rolls. you need to buy a total of 64 rolls. how much money will it cost for the rolls?

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