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A list of numbers from 20 to 40 has a standard deviation of x. By which of the following methods will the standard deviation decrease the most?
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A. Subtracting 20 from all the numbers
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B.Subtracting 10 from all the numbers
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C.Dividing all the numbers by 2
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D.Multiplying all the numbers by 0.1
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E.Turning all the numbers to the 80% of the original
D显示答案
