Quantity A: the standard deviation of the odd numbers between 1 and 19 inclusive Quantity B: the standard deviation of the even

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问题 Quantity A: the standard deviation of the odd numbers between 1 and 19 inclusive
Quantity B: the standard deviation of the even numbers between 2 and 22 inclusive

选项 A、Quantity A is greater.
B、Quantity B is greater.
C、The two quantities are equal.
D、The relationship cannot be determined from the information given.

答案B

解析 根据标准方差的性质,1到19奇数的标准方差等于2到20之间偶数的标准方差(数列每一项都加上一个常数,标准方差不变),而现在2到22比2到20多两个数,而且22>20,所以根据数偏离平均值越大,标准差越大。应该选择B。
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本试题收录于: GRE QUANTITATIVE题库GRE分类
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