Cholesterol Palace Is a Fast-Food Restaurant

Cholesterol Palace is a fast-food restaurant. Management was concerned with errors in filling orders at its drive-up window. It hired several undercover quality inspectors to randomly place 100 orders while the process seemed to be in control. The completed orders were then checked for accuracy. The following table shows the results of the survey:
Defect Frequency
Incomplete, shorted order 12
Unordered items dispensed 2
Wrong product dispensed 14
Wrong toppings 14
Wrong size drink 2
Drink lid not sealed 17
No drinking straw with soft drink order 0
No napkins 18
Far too many condiment packets 65
No salt with sandwich or fries order 10
Wrong change 3
Other 12
(a)Use these data to estimate the average number of defects per order and determine the three-sigma control limits for a c-chart.
(b)A quality inspector just used the drive-up window and now checks her order. Her cheeseburger has mustard on it although she ordered it without ketchup or mustard. Three handfuls of ketchup and mustard packets are in the sack, but no napkins. And hot coffee has spilled because the lid wasn't properly sealed. Is the drive-up process in control?