The neighborhood Clinkos Store has a single copy machine. The copier has been

observed to serve on average $16$ customers per hour during peak periods when it is never

idle; the service time of this copier is exponentially distributed. Customers arrive at the

copier according to a Poisson process with a mean of $12$ customers per hour.

$6.(1$ point$)$ What is the utilization of the copier? State your answer as a percentage with

at least three decimal points, e$.$g$.,50\mathrm{.}000($for $50\%$ utilization$).$

$7.(0\mathrm{.}5$ points$)$ What is the coefficient of variation of the customer interarrival time? If

your answer is not an integer, provide at least three decimal places, e$.$g$.,7\mathrm{.}500.$

$8.(0\mathrm{.}5$ points$)$ What is the coefficient of variation of the service time? If your answer is

not an integer, provide at least three decimal places, e$.$g$.,7\mathrm{.}500.$

$9.(1$ point$)$ What is the average service time of the copier in minutes? If your answer is

not an integer, provide at least three decimal places, e$.$g$.,7\mathrm{.}500.$