18-59. Operational Performance Measures-Visualization ( LO 18-6) Henderson Parts manufactures parts for turbines. The company is in the process of adopting lean manufacturing techniques to remain competitive. Part of the effort is to eliminate as much of the non value-added time in production as possible. The plant controller prepares a weekly production efficiency report and sends it to corporate headquarters. The data compiled in these reports for a recent eight-week period follow: Required a. Write a memo to the company president evaluating the plant's performance. Use data visualizations as appropriate. b. If you identify any areas of concern in your memo, indicate your recommended action for management to take. Indicate any additional information you would like to have to make your evaluation