In the new Dunn Zone at Waldo stadium the university has decided to run a promotion to increase student attendance. For this promotion, the first 200 students that enter the stadium before kickoff will be allowed to draw raffle ticket from a bucket. If the ticket has a "W" on it the student will be given a free t- shirt. In the bucket there are 200 tickets and 36 of them have a W. Let's consider the first 20 students that draw a raffle ticket and calculate the following.
A. What is the expected number of W's drawn?
B. What is the probability that exactly 7 students draw a W?
C. What is the probability that at most 4 students draw a W?