9.1 The supervisor at the Amernican 9.1 The supervisor at the American airline check-in counter observes the following airline check-in counter observes the following process characteristics: the average amount of a passenger spends on check-in is 30 minutes from start to end; there is, on average, one customer exiting the check-in counter every 45 seconds. Q: On average how many people are in the queue or are being helped by an agent for check-in at any given time? 9.2 The supervisor at the American airline check-in counter observes the following prooess characteristics: all the agents can, together, complete checking in 100 custamers per hour on average; there are, on average, 36 customers either waiting in line or beling helped by an agent for check-in. Q: how much time, on average, does each customex have to spend in the check-in area? 9.3 The supervisor at the American airline check-in counter observes the following process characteristics: there are, on average, 20 customers either waiting in line or being help by an agent for check-in; the average amount of a passenger spends on check-in is 16 minutes from start to end 0: a) How many passengers can American Airlines complete checking therm in per hour? b) How often does one passenger complete check-in and exit the area