Please help with parts c$,$ d$,$ and e$.$ Answer the following questions, assuming that Gubser uses one welder to complete all jobs.

$($a$)$ What is the mean arrival rate in jobs per hour? $($Round your answer to four decimal places.$)$

per hour

$($b$)$ What is the mean service rate in jobs per hour? $($Round your answer to four decimal places.$)$

per hour

$($c$)$ What is the average number of jobs waiting for service? $($Round your answer to four decimal places.$)$

Enter a number.

$($d$)$ What is the average time $($in hours$)$ a job waits before the welder can begin working on it$?($Round your answer to two decimal places.$)$

h

$($e$)$ What is the average number of hours between when a job is received and when it is completed? $($Round your answer to two decimal places.$)$

h

$($f$)$ What percentage of the time is Gubser's welder busy? $($Round your answer to the nearest whole number.$)$

$\%$