Please show formulas

Customers arrive at teller windows at a bank at the rate of 9 per hour. A teller is able to process 18 customers per hour on average. If the bank has a goal that customer wait time should be no more than 60 seconds to see a teller, how many tellers should the bank have available to process customer requests? Click the icon to view the Lo values for the queuing model. The bank should have at least tellers available to process customer requests to meet their goal of less than 60 seconds of waiting per customer on average. (Enter your response as a whole number.) The average time a customer must wait to have their request processed is seconds. (Enter your response rounded to two decimal places.) More Info / 0.40 Number of servers (M) 4 1 0.2667 0.45 0.3682 0.0240 0.0020 0.0002 0.50 0.5000 0.0333 0.0030 0.0003 0.55 0.6722 0.0450 0.0044 0.0004 0.60 0.9000 0.0593 0.0062 0.0006 0.65 1.2071 0.0768 0.0084 0.0009 0.70 1.6333 0.0977 0.0112 0.0112 0.0013 0.0001 0.75 2.2500 0.1227 0.0147 0.0018 0.0002 0.0003 0.80 3.2000 0.1524 0.0189 0.0024 4.8167 0.1874 0.0240 0.0032 0.85 0.0004 0.90 8.1000 0.2285 0.0300 0.0042 0.0005 0.95 18.0500 0.2768 0.0371 0.0054 0.0007 2 3 0.0167 0.0013 Print Done 5 X