Question: Computer upgrades have a nominal time of 80 minutes. Samples of five observations each have been taken, and the results are as listed. Using factors

Computer upgrades have a nominal time of 80 minutes. Samples of five observations each have been taken, and the results are as listed. Using factors from table, determine upper and lower control limits for mean and range charts, and decide if the process is in control.

Number of observations

n = 5 A^2 = .58 lower control limit D3 = 0 upper control limit D4 = 2.11

Please show all calculations/steps/formulas... I have answers if it helps

Mean: LCL is 78.88 UCL is 81.04

Range: LCL is 0 cm uCL is 3.95

79.2 80.5 79.6 7.9 80.5 79.7 78.8 78.7 79.6 794 79.6 80.6 800 81.0 804 79.7 80.4 80.5 78.4 80.4 80.3 79.4 80.8 80.0 81.0 80.1 80.8 80.6 78.8 81.1

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