Question: In a fabric manufacturing factory, the quality control process using control charts from SPC. In an hour there are a total of 5 samples are

In a fabric manufacturing factory, the quality
In a fabric manufacturing factory, the quality control process using control charts from SPC. In an hour there are a total of 5 samples are taken each having 4 observations regarding the thickness of fabric in measured in millimeters. In a particular hour, the sample means (X-bar) are noted to be: 156,46, 199.62, 189.31, 102.22 and 112.09 respectively. In the same sample, the corresponding ranges are: 11.97, 12.17.13.94, 11.86, and 11.83 respectively. What are the lower and upper controllimits for the X-bar chart? O a. 143.55,165.47 O b. 145.40, 190.72 Oc 144.77.159.11 O d. 142.92, 160.96 Oe. 156.55, 170.47 Of None is correct

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