There are 8 equal parts ach part is 1/8 of the paper'
write 1/8 on each of the eighths. now find the fraction equivalent to1/2 on your paper
so 1/2, -- and -- are equivalent

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