Priority Average Arrival Rate $($exponential interarrival times$)$

High $3$ per hour

Low $5$ per hour

Number of servers: $5$

Service rate: $2$ per hour $($exponential service times$)$

What is the system utilization factor?

Multiple Choice

$0\mathrm{.}50$

$0\mathrm{.}65$

$0\mathrm{.}80$

$0\mathrm{.}55$

$0\mathrm{.}45$