Question: Control charts on and s are to be maintained on the torque readings of a earing used in a wingflap actuator assembly. Samples of size

Control charts on and s are to be maintained on the torque readings of a earing used in a wingflap actuator assembly. Samples of size n = 10 are to be used, and we know from past experience that when the process is in control, bearing torque has a normal with mean µ = 80 inch-pounds and standard deviation of = 10 inch pounds. Find the center line and control limits for these control charts.

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