A manufacturer of precision machine parts produces round shafts for use in the construction of drill presses. The average diameter of a shaft is 0.42 inch with a standard deviation of 0.041 inch. A sample of 27 shafts is inspected and measured. What are the 99.7% lower and upper control limits for the x-bar chart? LCL = UCL = Round your answer to 4 decimal places. Round your answer to 4 decimal places.
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42$ inch. The standard deviation is $\sigma = 0.041$ inch. The sample size is $n = 27$. The 99.7% control limits correspond to 3 standard deviations from the mean. Show more…
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