How do you get the standard deviation this formula


Al quality control manager at a manufacturing facility has taken four samples with four observations each of the diameter of a part. IA quality control manager at a manufacturing faci Question: Compute an estimate of the mean and standard deviation of the sampling distribution. I understand how to get the mean. How do you get the standard deviation? ' This formula confuses me, can you please do it by step by step.

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Business Management: How do you get the standard deviation this formula
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