(Solution) - a In the analysis of a barrel of powder the -(2025 Original AI-Free Solution)

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(a) In the analysis of a barrel of powder, the standard deviation of the sampling operation is ± 4% and the standard deviation of the analytical procedure is ± 3%. What is the overall standard deviation?
(b) To what value must the sampling standard deviation be reduced so that the overall standard deviation is ± 4%?