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Set X consists of 100 numbers. The average (arithmetic mean) of set X is 10, and the standard deviation is 4.6. Which of the following two numbers, when added to set X, will decrease the set’s standard deviation by the greatest amount?
A.(-100) and (-100)
B.(-10) and (-10)
C.0 and 0
D.0 and 20
E.10 and 10
我的答案：