There is a woman that has a 40% chance of being in Casper recently, a 30% chance of being in Denver and a 27% chance that she has been to both. Find the probablility that she has been to Casper if she has been to Denver.
P(Casper) = .4
P(Denver) = .3
P(Casper u Denver) =0.27
P(Casper|Denver) P(Casper u Denver)/ P(Denver) = .27/.3 = 0.9