Process time at a workstation is monitored using sample mean and range control charts. Six samples of n = 9 observations have been obtained and the sample means and ranges computed (in minutes):

Sample	Mean	Range
1	3.26	0.50
2	3.08	0.45
3	3.10	0.47
4	3.28	0.40
5	3.15	0.44
6	3.15	0.54

a. Using the factors in Table 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