QUESTION 8 A cafeteria has a coffee urn from which customers serve themselves. Customers arrive at the urn at the rate of three per minute. In serving themselves, customers take about 15 seconds. All times are exponential. How many customers would you expect to see on average in the cafeteria? 1 customers 2.25 customers 3 customers O 0.75 customers O customers QUESTION 9 A cafeteria has a coffee urn from which customers serve themselves. Customers arrive at the urn at the rate of three per minute. In serving themselves, customers take about 15 seconds. All times are exponential. How many customers would you expect to see on average waiting in the line before the urn? 2.25 customers 3 customers O customers 1 customer 0.75 customers QUESTION 10 A cafeteria has a coffee urn from which customers serve themselves. Customers arrive at the urn at the rate of three per minute. In serving themselves, customers take about 15 seconds. All times are exponential. How long would you expect it to take you (from the moment you entered) to leave the cafeteria with a cup of coffee? 0.333 minutes 1 minute O minutes 0.25 minutes 0.75 minutes QUESTION 11 A cafeteria has a coffee urn from which customers serve themselves. Customers arrive at the urn at the rate of three per minute. In serving themselves, customers take about 15 seconds. All times are exponential. What percentage of time is the urn being used? 25% 133% 75 % 0% 100%