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Quantity A: the standard deviation of the odd numbers between 1 and 19 inclusive
Quantity A: the standard deviation of the odd numbers between 1 and 19 inclusive
游客
2024-01-12
65
管理
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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