For some time now I've been trying to figure out probably for a problem of the following form. Say a criminal profiler is trying to determine the probability that someone is a criminal based on statistical information. 60% of people who have mustaches are criminals. 70% of people who wear black hats are criminals. 80% of people who wear sunglasses are criminals. If the profiler is profiling an individual who wears sunglasses, a black hat, and has a mustache; how would she determine the probability that this individual is a criminal? By the way, this is not a homework problem, I'm just trying to understand how to apply probability better. Thanks a lot.