IKEA service desk operates returns, replacements, product defects, and requests for parts.There are $5$ service desks. Customers take a ticket upon arrival and go to the first available service desk.Waiting line observation shows that the average processing time by customer is $6$ minutes, with a $8$ minute standard deviation. Customers arrive on average every $2$ minutes, with a $1\mathrm{.}5$ minute standard deviation.a$.$ What is the average total time customer will experience in the service area?b$.$ If IKEA reduce to $4$ service desks, what would be the average waiting time $?$c$.$ Can IKEA reduce to $3$ service desks $?$ YES$/$NO$,$ comment.