A manager wishes to build a control chart for a process. A total of five (05) samples are collected with five (05) observations within each sample. The sample means (X-bar) are; 14.09, 13.94, 16.86, 18.77, and 16.64 respectively. Also, the corresponding ranges are: 9.90, 7.73, 2.89, 7 56, and 3.49 respectively. The lower and upper control limits of the x-bar chart are respectively Select one a. 12.40, 19.72 b. 19.72, 12.40 O by C. 18.55, 13.47 d. 16.55, 11.47 o A manager wishes to build a control chart for a process. A total of five (05) samples are collected with five (05) observations within each sample. The sample means (X-bar) are; 14.09, 13.94, 16.86, 18.77, and 16.64 respectively. Also, the corresponding ranges are: 9.90, 7.73, 2.89, 7 56, and 3.49 respectively. The lower and upper control limits of the x-bar chart are respectively Select one a. 12.40, 19.72 b. 19.72, 12.40 O by C. 18.55, 13.47 d. 16.55, 11.47 o