GWD5-34

evelyn205205 · 发表于 2011-2-6 10:47:17

Professor Vásquez 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.

每个班只有26个人，且两个班的平均成绩是85分。
70+分数2+分3+分4+。。。+分26=26*85——两个班都这样。
就要保证两个班的70+分数2+分3+分4+。。。分26都相等。
不是range要求一样么？因为人数是一样的呀！

sdcar2010 · 发表于 2011-2-6 11:12:14

The distribution might be different.

1) 70, 70, 70 ..(13 people got 70), 100, 100, ... 100 (13 epole got 100). The range is 30
2) 70, 85, 85, ... 85, (10 people got 85), 86, 86, ..., 86 (15 people got 86). The range is 16.

evelyn205205 · 发表于 2011-2-6 11:54:10

so ga
就算起点相同，范围有大有小，结果有可能是一样的。
THANK YOU！

GWD5-34

所属分类: GMAT考试

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