Measured at the lid center, the thickness of the zinc coating applied to container lids averages 3.000

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Measured at the lid center, the thickness of the zinc coating applied to container lids averages 3.000 mil, with a process standard deviation of 0.300 mil. Determine the centerline and the upper and lower control limits for a 3-sigma mean control chart in which each sample consists of 4 lids.
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