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What is the standard deviation of the average of ? independent measurements (i.e., ?,?,?,⋯,? ,⋯,?) whose...

What is the standard deviation of the average of ? independent measurements (i.e., ?,?,?,⋯,? ,⋯,?) whose standard deviations are (?,? ,? ,⋯,? ,⋯,? )? What will be the standard deviation if ?=? =? =⋯=? =⋯=? =? ?

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