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 10 minutes to evaluate each student's set of documents. On average, 4 students per hour go to his office and they spend, on average, 140 minutes trying to get their forms approved (time waiting in queue plus time in Max's office having him evaluate their documents). (Round your answer to 1 decimal place.) On average, how many students are waiting outside of Max's office