At a curbside baggage check-in station, passengers arrive at a Poisson rate of 20 per hour. Either 1, 2, or 3 bags are to be checked for each passenger, with it being equally likely to be 1 or 3 and twice as likely to be 2. The time required to check a bag is exponentially distributed with a mean of 1 minute. On average, how many bags are waiting to be checked? On average, how long does a bag wait to be checked? What percent of the time is the baggage attendant busy?