Customer interarrival times at a store are exponentially distributed with rate 8 customers per hour. Customers are served by a single customer service representative (CSR), with an average service time of 5 minutes. Service times are also exponentially distributed. Which of the following statements are true? The average number of customers in the store is 2.0. The probability of having one or more customer in the store is 0.222. None of the answers are correct. The store is busy (has customers) 33% of the time The average time spent waiting for the CSR is 15 minutes