Mark Lane approves study abroad documents for the University of Utah. Students must wait in line with their forms outside Mark's office. One student at a time is allowed in his office and Mark takes precisely 25 minutes to evaluate each student’s set of documents. On average 2.2 students per hour go to his office and they spend on average 160 minutes trying to get their forms approved (time waiting in queue plus time in Mark’s office having him evaluate their documents). On average, how many students are waiting outside of Mark’s office?
(Hint: You do not need to know CVa and CVp to solve this question but if you want, you can assume that CVa=1 and the standard deviation of the processing time is zero.)