Question: Amanager wishes to build a control chart for a process. A total of five (05) samples are collected with five (05) observations within each sample.

Amanager 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 . None is correct Ob. 16.55. 11.47 . 12.40. 19.72 O d. 18.55. 13.47 O e. 12.60.20.36
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