The following sample value represents service times in minut

The following sample value represents service times in minutes. Center line for the R-chart and x-chart should be the average of the sample ranges and the average of the sample averages, respectively.  

Observation number  

Sample number     1    2    3    4   5

1                            6.1 6.6 5.8 5.9 6.9

2                            5.7 5.5 6.3 5.9 6.5

3                             6.1 6.7 5.2 6.0 6.1

4                             5.9 5.8 5.5 6.4 6.1

5                             6.4 6.1 5.9 6.9 6.3

For the -chart, what is the value of UCL?

a) greater than 6.99

b) greater than 5.99 but less than or equal to 6.99

c) greater than 5.00 but less or equal to 5.99

d) less than or equal to 5.00

For the -chart, what is the value of LCL?

a) greater than 6.99

b) greater than 5.99 but less than or equal to 6.99

c) greater than 5.00 but less than or equal to 5.99

d) less than or equal to 5.00

The answer choice in bold is the one I think it is

Solution

Option (C) is correct.