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

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

admin2022-05-18  23
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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