The Air Travel Consumer Report, a monthly product of the Department of Transportation’s Office of Aviation Enforcement and Proceedings (OAEP), is designed to assist consumers with information on the quality of services provided by airlines. The report includes a summary of consumer complaints by industry group and by complaint category. A breakdown of the 1,188 October 2017 consumer complaints based on industry group is given in the following table stored in AirlineComplaints1 :

a. Construct a Pareto chart for the number of complaints by industry group. What industry group accounts for most of the complaints? The 1,188 consumer complaints against airlines are summarized by type in the following table stored in AirlineComplaints2:

b. Construct pie and doughnut charts to display the percentage of complaints by type. What complaint category accounts for most of the complaints?

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Industry Group Number of Consumer Complaints 741 398 U.S. Airlines Non-U.S. Airlines Travel Agents Tour Operators Miscellaneous Industry Total Source: Data extracted from "The Travel Consumer Report." Office of Aviation Enforcement and Proceedings, October 2017. 24 1 24 1,188