PLEASE ANSWER I'M DESPERATE

a coffee dispenser is supposed to pour out 16 ounces of coffee. the machines are not entirely perfect, since the standard deviation is .3 ounces. assume you test the machine and pour 50 cups of coffee, and come up with a sample mean of 15.8 ounces. what is the probability that you would get a result of 15.8 or lower?

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