$-$ Problem $2(30$ points$)($Do it handwritten$)$

Consider a single$-$machine workstation. Parts arrival at a rate of $15$ parts$/$hr$.$ Arrival CV is $0\mathrm{.}5.$ The station has a mean effective process time $3$ mins and the standard deviation is also $3$ mins. Assume an $\backslash ($ M $/$ M $/$ I $\backslash )$ queue, compute $\backslash ($ C T$\_\{$q$\}\backslash ),$ CT and WIP. How would these numbers change if we added an identical machine into the workstation.