Please add an explanation too, I'm still figuring out how to solve stuff like this

Toyland is having a sale. all items are 20% off. how much will you save on an item that usually sells for 95$ explain your

What is the range for 31,39,29,34,37,24,36,33,34,28

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