Process time at a workstation is monitored using sample mean and range control charts. Six samples of n=8 observations have been obtained and the sample means and ranges computed (in minutes): Sample 1 2 Mean Range 3 4 5 6 Mean 3.06 3.27 3.16 3.20 3.30 3.21 Range 0.43 0.44 UCL 0.44 0.43 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.) 0.51 0.40 LCL

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