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; 15.36,...

Extracted text: 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; 15.36, 14.61,16.36,20.28, and 15.77 respectively. Also, the corresponding ranges are; 10.79, 8.37, 2.81,8.17, and 3.31 respectively. The lower and upper control limits of the x-bar chart are respectively Select one .a None is correct 20.36 ,12.60 .C 13.47 ,18.55 19.72 ,12.40 .e 11.47,16.55 The correct answer is 12.60, 20.36