Question: Control Charts for a process have previously been constructed. The X - Barr Chart upper and lower control limits are 9 2 . 5 and

Control Charts for a process have previously been constructed. The X

-

Barr Chart upper and lower control limits are

92.5

and

88.5,

respectivley. New samples are taken from three machines with the following results: Which machine, if any, appear to have an out of control process mean based solely on the X

-

Bar Chart?

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