A design engineer wants to construct a mean chart for controlling the diameter for a component used in surgeries. The following table contains measurements (in millimeters) of the diameter for a component. Four samples of five units each were taken at random two-hour intervals. Sample 1 Measurements (in millimeters) 9 10 9 8 8 2 9 7 9 9 8 3 8 9 9 10 10 4 9 9 9 9 9 What are the X-bar chart upper and lower control limits? 9.945 and 7.775 9.872 and 7.828 9.72 and 7.98 10.01 and 7.15 9.67 and 7.93