Q22 - Q23 are based on the problem below.

The Din Tai Fung at the Westfield Valley plans to improve its wait time. Based on its observational study, customers arrive at the restaurant every 1 minute, on average, and the standard deviation of the inter-arrival time is 4 minutes. It takes on average 60 minutes for a table of customers to finish dining, and the standard deviation of the dining service time is 150 minutes. Currently the restaurant has 65 tables.

Q22. What is the average utilization level?

Q23. What is the average customer wait time before getting a table? (Hint: use the VUT equation.)