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If the standard deviation of 3, 8, 6, 10, 12, 9, 11, 10, 12, 7 is 2.71, then the standard deviation of 30, 80, 60, 100, 120, 90, 110, 100, 120, 70 is

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2.71

27.1

$(2.71) \sqrt{10}$

$(2.71) \sqrt{2}$

answer is B.

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$V (a x) = a^{2} V (x)$

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