Question: Making auto parts. An automatic grinding machine in an auto parts plant prepares axles with a target diameter = 40.125 millimeters (mm). The machine

Making auto parts. An automatic grinding machine in an auto parts plant prepares axles with a target diameter

μ = 40.125 millimeters (mm). The machine has some variability, so the standard deviation of the diameters is σ =

0.002 mm. A sample of 4 axles is inspected each hour for process control purposes, and records are kept of the sample mean diameter.

What will be the mean and standard deviation of the numbers recorded?

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