second picture is the Table 10.3 to be used for the question

Process time at a workstation is monitored using sample mean and range control charts. Six samples of n = 10 observations have been obtained and the sample means and ranges computed (in minutes): Sample 1 2 3 4 5 6 Mean 3.06 3.22 3.27 3.14 3.03 3.19 Range .47 .46 .54 .51 .45 .47 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 b. Is the process in control? O Yes O No Table 10-3 Factors for Three Sigma control limits for 2- and R-charts. Factor for X Charts, Number of Observations in Sample, n 2. Factors for R-Charts Lower Upper Control Limit Control Limit, D DA 0 3.27 A2 1.88 3. 1.02 2.57 2.28 0.73 5 0.58 2.11 6. 0.48 o 2.00 7 0.42 0.08 1.92 8 0.37 0.14 1.86 0.34 0.18 1.82 10.... 0.31 0.22 1.78 11 0.29 0.26 1.74 12. 0.27 0.28 1.72 13. 0.25 1.69 0.31 0.33 14.. 0.24 1.67 15... 0.22 0.35 1.65 16.... 0.21 0.36 1.64 17 0.20 0.38 1.62 18. 0.19 0.39 1.61 19. 0.19 0.40 1.60 20. 0.18 0.41 1.59 Source: Adapted from Eugene Grant and Richard Leavenworth, Statistical Quality Control, 4th ed. (New York: McGraw-Hill , 1972), p. 645