Explain supermarket is monitored using a range, 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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