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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