Question: PLEASE help my with the right answer please A manager wishes to build a control chart for a process. A total of five (05) samples

PLEASE help my with the right answer please A

PLEASE help my with the right answer please

A manager wishes to build a control chart for a process. A total of five (05) samples are collected with four (04) observations within each sample. The sample means (X-bar) are; 14.09, 13.94,16.86, 20.00, and 16.64 respectively. Also, the corresponding ranges are; 9.90, 7.73, 4.41,7.56, and 3.49 respectively. The lower and upper control limits of the x-bar chart are respectively Select one: a. 11.29, 20.65 O b. 11.47, 16.55 O c. 11.47, 21.14 O d. 11.44, 20.66 O e. None is correct

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