Process time at a workstation is monitored using sample mean and range control charts. Six samples with 10 observations each have been obtained and the sample means and ranges computed (in minutes) as follows:

Sample	Mean	Range
1	4.6	0.68
2	4.32	0.52
3	4.42	0.64
4	4.6	0.68
5	4.54	0.62
6	4.4	0.78

What are the upper and lower limits for sample range control chart? (Round the intermediate calculations to 2 decimal places. Round the final answers to 3 decimal places.)

		UCL = 1.155, LCL = 0.145
		UCL = 0.962, LCL = 0
		UCL = 1.303, LCL = 0
		UCL = 0.793, LCL = 0.167
		None of the above