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标题: 请教TTgwd-30-４（看了答案还是想不通） [打印本页]

作者: 幽幽sally 时间: 2006-10-21 13:48
标题: 请教TTgwd-30-４（看了答案还是想不通）

Q4:

Professor Vasquez gave a quiz to two classes. Was the range of scores for the first class equal to the range of scores for the second class?

(1)
In each class, the number of students taking the quiz was 26, and the lowest score in each class was 70.

(2) In each class, the average (arithmetic mean) score on the quiz was 85.

A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.

B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.

C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.

D. EACH statement ALONE is sufficient.

E. Statements (1) and (2) TOGETHER are NOT sufficient.

答案是E,我选C的～

同志们～快来解答下吧～

作者: irisyuzh 时间: 2006-10-21 14:05

虽然知道两个班人数相同,最低分相同,但是求RANGE所需的最高分不能有平均分确定,所以选E

作者: diddy101us 时间: 2006-10-21 14:07
选E没错啊。mean不能说明问题啊，要知道range要知道两个班的最高分的那个分别是多少，这个你没法知道啊。

作者: 幽幽sally 时间: 2006-10-21 14:34
谢谢楼上２位～知道错哪了～

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