The third and fourth grade teachers are planning a trip for their classes to the zoo there are 173 third grader and a 124 fourth grader Each seat on the bus fits three students which expression represents the closest estimate of the number of seats on the buses that are needed for the students

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