Question $19(0\mathrm{.}5)$ A multiple server $($channel$)$ system has customers arriving at an average rate of $4$ per hour and an average service rate of $1\mathrm{.}5$ per hour per server. What is the minimum number of servers required for this system to be feasible$/$sustainable$?3$ servers S servers $2$ servers $4$ servers Question $20(0\mathrm{.}5)$ A system has one service facility that can service on the average $14$ VW$05$ customers per hour. The customers arrive at a variable rate, which averages $10$ per hour. Waiting line will not occur since service rate is bigger than arrival rate. Waiting line will not occur since utilization ratio is less than $1.$ Waiting line may occur since customer arrival rate and service rate are variable. Since there is excess capacity, no waiting lines will form.