Process time at a workstation is monitored using sample mean and range control charts. Six samples ofn= 14 observations have been obtained and the sample means and ranges computed (in minutes):

Sample	Mean	Range
1	3.18	0.55
2	3.15	0.51
3	3.10	0.43
4	3.09	0.40
5	3.14	0.48
6	3.15	0.41

a.Using the factors inTable 10-3, determine the upper and lower limits for sample mean and range control charts.(Round the intermediate calculations to 2 decimal places. Round the final mean answers to 2 decimal places. Round the final range answers to 3 decimal places.)

	UCL	LCL
Mean
Range

b.Is the process in control?

multiple choice

• Yes

• No