作业帮GMAT Data Sufficiency QuestionIs the standard deviation of the set of measurements x1,x2,x3,x4,...,X20 less than (1) The variance for the set of measurements is 4.(2) For each measurement,the difference between the mean and that measurement is 2.一
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GMAT Data Sufficiency QuestionIs the standard deviation of the set of measurements x1,x2,x3,x4,...,X20 less than (1) The variance for the set of measurements is 4.(2) For each measurement,the difference between the mean and that measurement is 2.一
GMAT Data Sufficiency Question
Is the standard deviation of the set of measurements x1,x2,x3,x4,...,X20 less than
(1) The variance for the set of measurements is 4.
(2) For each measurement,the difference between the mean and that measurement is 2.
一道充分性判断题.标准答案我已经知道,
首先,这道题我不大读得懂,可能是因为它考的知识点不在我的课程范围内.这里是否考的是离散数学的内容?
本题的标准答案是（D) EACH statement ALONE is sufficient.
GMAT Data Sufficiency QuestionIs the standard deviation of the set of measurements x1,x2,x3,x4,...,X20 less than (1) The variance for the set of measurements is 4.(2) For each measurement,the difference between the mean and that measurement is 2.一
先简单翻译一下：
请问一组测量值x1, x2, x3, x4, ..., X20的标准差是否小于3?
（1）这组测量值的方差是4.
（2）每一个测量值与其平均值的差是2.
（1）：如果该组数的方差是4,则标准差是2,即可推出其标准差小于3,充分.
（2）：如果每个数与其平均值的差是2,则说明标准差也是2,即可推出其标准差小于3,充分.
因此选（D）Each statement alone is sufficient.
希望对你有帮助~~