$?$ Virginia $\text{'}$ s Ron McPherson Electronics Corporation retains a service crew to repair machine breakdowns that occur on an average of $\backslash$ lambda $?=2$ ?per $?8-$ hour workday $?($ approximately Poisson in $?$ ?nature $).$ ? The crew can service an average of $\backslash$ mu $?=6$ ?machines per $?$ ?workday, with a repair time distribution that resembles the negative exponential distribution.

Part $2$

$?$ a $)$ ?The utilization rate of this service system $?=0\mathrm{.}33?($ round your response to two decimal $?$ ?places $).$

Part $3$

$?$ b $)$ ?The average downtime for a broken machine $?=$ ?enter your response here days $?($ round your response to two decimal $?$ ?places $).$