[讨论]"无味"GG 的疑问---大家来看一下!

linda · 发表于 2003-3-21 18:11:00

26) is the standard deviation of T(一数列) greater than S(一数列) ?
(1) mean of T is greater than that of S
(2) median of T is greater than that of S
Answer: A

i have a question for the question 26, suppose the mean is bigger doesn't mean that the SD will be bigger or not, because it don't say that the data is connected. For example the data A of 10, 10, 10, the mean is 10 la
and for the data B 1, 3, 5 the mean is 3
but the SD for data A of course is greater than B la

Layla · 发表于 2003-3-24 00:09:00

The standard deviation of A is 0, and SD of B is 2/3 * root square 6. So the SD of A is smaller than that of B la.

1stzhang · 发表于 2003-3-25 15:42:00

我觉得选E,standard deviation 表示数列中的中的偏离程度和平均数和中数无关；
例如A数列为{2、2、2、2、2、2、2、2、2、2、2、2}
B为{3、3、3、3、3、3、3、3、3、3、3}
B的平均数和中数都大于A,但是sd是相同的！

[讨论]"无味"GG 的疑问---大家来看一下!

[讨论]"无味"GG 的疑问---大家来看一下!

所属分类: GMAT考试

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