Question: On an SPC chart, the worker takes 7 samples every hour. Using the following information, what are the LCL and UCL for the Xbar chart?

On an SPC chart, the worker takes 7 samples every hour. Using the following information, what are the LCL and UCL for the Xbar chart? [Xbars for each hour: 25,24,32,34,33,34 with the corresponding ranges being: 7,8,6,9,5,8]

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