Question: Control charts for X-bar and Range (R) are kept on the weight in kilograms of a color pigment for a process. After 4 samples of

Control charts for X-bar and Range (R) are kept
Control charts for X-bar and Range (R) are kept on the weight in kilograms of a color pigment for a process. After 4 samples of size 6 each, the sum of all sample means is 52.00 kg and the sum of all ranges of samples is 11.82 kg. Lower control limits for Rand X-bar, respectively are Select one: a. 4.49 and 10.12 b. O and 10.12 c. O and 7.24 d. O and 14.44 e. O and 11.6

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