Constructing a Pareto chart. You manage the customer service operation for a maker of electronic equipment sold to business customers. Traditionally, the most common complaint is that equipment does not operate properly when installed, but attention to manufacturing and installation quality will reduce these complaints. You hire an outside firm to conduct a sample survey of your customers. Here is the percent of customers with each of several kinds of complaints:
(a) Why do the percents not add to 100%?
(b) Make a Pareto chart. What area would you choose as a target for improvement?