2. 外语
  3. Quantity A: the standard deviation of x-3, x-2, x-1, x, x+1, x+2 Quantity B: the standard deviation of y-3, y-2, y, y+1, y+2

Quantity A: the standard deviation of x-3, x-2, x-1, x, x+1, x+2 Quantity B: the standard deviation of y-3, y-2, y, y+1, y+2

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问题 Quantity A: the standard deviation of x-3, x-2, x-1, x, x+1, x+2
Quantity B: the standard deviation of y-3, y-2, y, y+1, y+2
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C
解析 利用standard deviation的性质，两个序列的标准方差都和-3，-2，-1，0，1，2相同，因此选择C。
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