thank you so much for the help!

A design engineer wants to construct a sample 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. Observation number Sample 1 . 8 10 10 2 9 7 9 10 9 9 What is the estimate of the process mean for whenever it is under control? 8.85 O 8.5 O 9.2 O 8.4 A design engineer wants to construct a sample 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. hervation number Sample 10 9 8 9 8 10 10 99 9 9 7 9 9 9 What is the estimate of the sample average range based upon this limited sample? o 1.5 O 1.4 0 1 O2 A design engineer wants to construct a sample 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. Observation number Sample 9 2 9 10 10 10 8 9 9 9 5 8 8 7 9 What are the x-bar chart upper and lower control limits? 10.01 and 7.15 09.72 and 7.98 9.945 and 7.775 09.872 and 7.828 O 9.67 and 7.93