Question: In painting an automobile at the factory the thickness of

In painting an automobile at the factory, the thickness of the color coat has a process mean of 1.00 mil and a process standard deviation of 0.07 mil. Twenty samples of five cars were tested, resulting in the mean paint thicknesses shown below.
(a) Construct upper and lower - control limits for the x chart, using the given process parameters.
(b) Plot the data on the control chart.
(c) Is this process in control? Explain your reasoning.

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