R-bar value of 0.78

Problem A: The time needed for checking in at a hotel is to be investigated. The means of 39 samples of n = 14 are: Sample Mean Sample Mean Sample Mean Sample Mean 1 3.86 11 3.88 21 3.84 31 3.88 2 3.90 12 3.86 22 3.82 32 3.76 3 3.83 13 3.88 23 3.89 33 3.83 3.81 14 3.81 24 3.86 34 3.77 5 3.84 15 3.83 25 3.88 35 3.86 6 3.83 16 3.86 26 3.90 36 3.80 7 3.87 17 3.82 27 3.81 37 3.84 8 3.88 18 3.86 28 3.86 38 3.79 9 3.84 19 3.84 29 3.98 39 3.85 10 3.80 20 3.87 30 3.96 a) Construct an X-bar chart for this process. Is the process in control? b) Calculate Cr.of the process if customer specifications are USL = 4.0 and LSL = 3.80. Is the process capable