A mixture in a chemistry class calls for Four-fifths of a liter of hydrogen peroxide. The instructor has only Three-fourths of the needed amount. How much hydrogen peroxide does the instructor have? StartFraction 1 Over 20 EndFraction of a liter of hydrogen peroxide Two-fifths of a liter of hydrogen peroxide Three-fifths of a liter of hydrogen peroxide 1 and 11 Over 20 liters of hydrogen

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