The local DMV always seems to have very long lines. Customers arrive to the DMV at a rate of 20 per hour. On average, it takes 25 minutes to serve each customer. The standard deviation of interarrival times is 5 minutes and the standard deviation o processing times is 30 minutes. The local DMV is considering hiring additional customer service agents, such that they would have a total of 12 agents. Under this increased level of staffing, what would be the average number of customers being served by agents at any given time