On a certain day, the temperature changed at a rate of -2°F per hour. How long did it take for the change in temperature to be -12°F?

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

Is experimental probibilty the same as the observed frequency in math? i need the answer asap!

597008.439431 to the nearest thousand