Henry and Ann are waiting for a bus. They know from experience that if they wait for an hour, they will have a 90% chance of getting it. It is a chilly night, though, so Ann says, "Let's only stay out for 10 minutes."
Henry says, "If we only wait for 10 minutes, we will only have a 15% chance."
Ann replies, "Not true. We have a better chance than that." Is Ann right? If so, what is the probability that they getting on the bus?