Question: The time needed for performing a machining operation is to be investigated. Historically, the process has had a standard deviatio equal to 0.175 minutes. The

The time needed for performing a machining operation is to be investigated. Historically, the process has had a standard deviatio equal to 0.175 minutes. The means (in minutes) of 39 samples of n=6 are: The average of the 39 sample means is equal to 3.78 . a. Construct an X-chart for this process with two-sigma limits. (Round the final answers to 2 decimal places.) b. Is the process in control

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