Suppose that the average time between customer arrivals is $15$ minutes.$$ Suppose customers are served, by a single customer service representative at a rate of $5$ customers per hour.$$ Assume interarrival times and service times are exponentially distributed.$$

The customer service representative is compensated at $$20$ per hour.$$ Customer waiting costs are estimated at $$1$ per minute or $$60$ per hour for each customer waiting.

If the system operates in steady$-$state, then

Group of answer choices

The per hour cost of customer waiting would be $$60.$

$3\mathrm{.}20$ customers are waiting on average in this queuing system.

The total cost of waiting in this queuing system would be $$192$ per hour.

The total cost of operating the queueing system would be $$212$ per hour.

Exactly three answers are correct.

All answers are correct.