Question: In an existing process, we have found that the lower and upper control limits for X-bar chart are 8.08 and 8.59 respectively. Whereas, the lower

In an existing process, we have found that the lower and upper control limits for X-bar chart are 8.08 and 8.59 respectively. Whereas, the lower and upper control limits for R-chart are 0 to 1.25 respectively. The following measurements for one sample are taken: 8.5, 9.14, 8.28, and 8.00. Using X-bar chart only, what we can conclude about the process mean O a. Overall process is in-control O b. Process mean is in-control O c. Process mean is out-of-control. O d. Insufficient information to conclude

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