Calculate the ucl and lcl for the x bar and r chart

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Reference no: EM13107591

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.

Reference no: EM13107591

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