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.$$

In steady state

Group of answer choices

The average number of customers waiting to be served in the store is $4.$

The average wait to be served in the store is $48$ minutes.

The average time spent in the store is $63$ minutes.

There is a $25\%$ chance that a customer arrives and finds the store empty.

Exactly two answers are correct.

None of the answers are correct.