Medical researchers believe that the probability of getting lung cancer if a person smokes is 0.34. The probability that a nonsmoker will get lung cancer is 0.03. It is also known that 11% of the population smokes. What is the probability that a person with lung cancer is a smoker?
That question was also asked here, but I'm not sure if the answer is correct or not; I just found the link. http://mathforum.org/library/drmath/view/56684.html