题目信息
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
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正确答案：
E:10 and 10
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题目来源
Magoosh
