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?

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.

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