In many applications, there may be a limit on the number of customers that can wait before being served, which is called the buffer capacity. When the buffer is full, any new arrivals are turned away, which is called blocking. As the buffer capacity is increased, the proportion of blocked customers _______, and more customers are able to get into the process. At the same time, the average waiting time of the customers who do get in _______.

**decrease; increase

**decrease; decrease

**increase; increase

**increase; decrease

A fast-food restaurant has problems with its drive-through window operations. Customers arrive at an average rate of one every 30 seconds. Current service time has averaged 25 seconds with a standard deviation of 20 seconds. A suggested process change, when tested, results in an average service time of 25 seconds with a standard deviation of 10 seconds. Assume that no customers are blocked or abandon the system.

What would be the effect of this change on the server utilization rate?

**increase

**decrease

**It remains the same because average demand and service rates do not change.

**Given information is not sufficient to answer.