Question: quality engineer at Lockheed Martin is required as a part of ISO AS9100 certification to check the tolerances on all aerospace components every hour.

quality engineer at Lockheed Martin is required as a part of ISO AS9100 certification to check the tolerances on all aerospace components every hour. The Quality Assurance team utilizes x-bar and R-charts to monitor the process. Eight times throughout the course of a shift, the quality engineer collects four samples (n=4) from a manufacturing line for inspection. The data collected by the engineer for this part is as follows: Group 1 Group 2 Group 3 Group 4 Group 5 Group 6 Group 7 Group 8 Mean (mm) 12.01 13.28 14.01 13.99 14.13 13.73 14.42 13.97 What is the X-bar Lower Control Limit (LCLx)? Go to two decimal places. Range (mm) 0.4 0.6 0.2 0.5 0.6 0.3 0.8 0.4

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