Question 11 OK, same bank, different system. Now we're looking at the drive-up window system at the main bank. There are three teller windows at the drive-thru to serve customers. Each window has its own dedicated teller. Customers who arrive can drive right up to a window if any are free. If not, the customer joins a single line waiting for service. As a teller becomes free, the next car in line (if any) goes to that open window Historical data shows that customers arrive about one every 2.5 minutes. Each teller can serve on average 15 customers per hour. On average, how many customers will be waiting in line at this system? a. 0.0094 b..3128 c..8888 d. 2.12 e. 7.673