A 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: Mean (mm) Range (mm) Group 1 12.01 0.4 Group 2 13.28 0.6 Group 3 14.01 0.2 Group 4 13.99 0.5 Group 5 14.13 0.6 Group 6 13.73 0.3 Group 7 14.42 0.8 Group 8 13.97 0.4 What is the X-bar Upper Control Limit (UCLx)? Go to two decimal places. Question 4 options: