Max Stamp approves study abroad documents for the university. Students must wait in line with their forms outside Max$$s office. One student at a time is allowed in his office and Max takes precisely $15$ minutes to evaluate each student$$s set of documents. On average, two students per hour go to his office and they spend, on average, $150$ minutes trying to get their forms approved $($time waiting in queue plus time in Max$$s office having him evaluate their documents$).$ On average, how many students are waiting outside of Max$$s office?