2. 外语
  3. Quantity A: The standard deviation of the numbers 45, 64, 83, and 53 Quantity B: The standard deviation of the numbers 55, 81, 4

Quantity A: The standard deviation of the numbers 45, 64, 83, and 53 Quantity B: The standard deviation of the numbers 55, 81, 4

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问题 Quantity A: The standard deviation of the numbers 45, 64, 83, and 53
Quantity B: The standard deviation of the numbers 55, 81, 47, and 62
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A
解析 45=47-2，53=55-2，64=62+2，83=81+2，由此可见Quantity A和Quantity B两个数列平均值相等，而Quantity A数列中的数与平均值差距更大。故答案为A。
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