[20 points]
earth's outer core can be modeled by a spherical shell that extends from a distance of approximately 1,200 kilometers from earth's center to approximately 3,400 kilometers from earth's center. which of the following is closest to the volume of earth's outer core, in cubic kilometers?
a) 1.52 x 10^7
b) 3.18 x 10^7
c) 4.46 x 10^10
d) 1.57 x 10^11
!

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