In a certain town, only males are surveyed. A study showed that 35% of all males have blond hair, and 14% of all males have blond hair and blue eyes. If a male is selected at random, what is the probability that he has blue eyes given that he has blond hair?
If you are given he has blond hair, so the total probability will be 35%. And among them, he needs to have blue eyes, its probability is 14% among the 35%. So the final probability is 14%/35%=40%.