Table $12-3$

M$/$M$/3$

$$

Mean Arrival Rate:

$4$ occurrences per minute

Mean Service Rate:

$2$ occurrences per minute

Number of Servers:

$3$

$$

$$

Queue Statistics:

$$

Mean Number of Units in the System:

$2\mathrm{.}889$

Mean Number of Units in the Queue:

$0\mathrm{.}889$

Mean Time in the System:

$0\mathrm{.}722$ minutes

Mean Time in the Queue:

$0\mathrm{.}222$ minutes

Service Facility Utilization Factor:

$0\mathrm{.}667$

Probability in No Units in System:

$0\mathrm{.}111$

According to the information provided in Table $12-3,$ which presents a queuing problem solution, what is the utilization rate of the service facility?

$0\mathrm{.}667$

$0\mathrm{.}722$

$0\mathrm{.}222$

$0\mathrm{.}889$