Explain sample means and sample ranges have been computed, Operation Management

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Checkout time at a supermarket is monitored using a range and mean chart. Six samples which contain 20 observations per sample have been collected and the sample means and sample ranges have been computed as shown below: Sample Mean Range 1 3.05 0.42 2 3.01 40.44 3 3.11 0.39 4 3.45 0.49 5 4.11 0.53 6 3.09 0.45 Determine the UCL and LCL for the X-Bar and the R-Chart for the sample size of 6.

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