Group tours of the Luray Caverns in Luray, VA, begin about every 20 minutes. the first group toured the caverns from 9 A. M. to 10:12 A. M. the second group of the day toured from 9:20 A. M. to 10:35 A. M. complete the strip diagram to model how much longer the second tour was than the first tour.

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