14 karat gold is a mixture of pure gold in other metals. 1 ounce of 14 karat gold contains 0.58 ounce of pure gold. Part A

If a 14 karat gold necklace was 1.8 ounces how many ounces of pure gold does it contain?

Part B

If a 14 karat ring weighs 0.5 ounce how many ounces of pure gold does it contain?

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