Question: Six samples of five observations each have been taken for a process. The sample means and ranges computed (in minutes) are, (mean, range): (3.54, 0.41),

Six samples of five observations each have been

Six samples of five observations each have been taken for a process. The sample means and ranges computed (in minutes) are, (mean, range): (3.54, 0.41), (3.82, 0.58), (3.84, 0.42), (3.94, 0.66), (3.69, 0.64), and (3.61, 0.79). Compute the upper control limit Oa. 2.753 Ob. 4.02 OC. 2.379 O d. 4.078

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