A particular fast food restaurant is located near a University. 50% of the customers are students. Students prefer the spicier items. For example, a student customer will ask for extra hot sauce 75% of the time whereas a non-student will ask for extra hot sauce only 40% of the time. While waiting in line you observe a customer ask for extra hot sauce. What is the probability that this customer is not a student? The manager claims that about half the customers ask for extra hot sauce. Do you agree?