There are 22 students in Mrs.​ Pietz's fifth grade class at an international school. All of the students speak either English or​ Japanese, and some speak both languages. Of the​ students, 13 can speak English and 12 can speak Japanese.

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