A professor sits in his office and answers questions from his students the afternoon before the final exam On average, he can answer 60 questions an hour and 12 students amive at his office every hour.
a. What is the average number of students waiting outside his office?
b. What is the average time a student spends in line outside the professors office?
c. What is the probability of more than 2 students either in his office or waiting outside his office?