2. 外语
  3. In a class of 80 people, Mary’s percentile is 90％. In another class of 100 people, 19 people’s percentile is greater than Mary’s

In a class of 80 people, Mary’s percentile is 90％. In another class of 100 people, 19 people’s percentile is greater than Mary’s

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问题 In a class of 80 people, Mary’s percentile is 90％. In another class of 100 people, 19 people’s percentile is greater than Mary’s. If the two classes are to be merged into one, what will Mary’s percentile be in the new class?
选项 A、75％
B、72％
C、85％
D、72.9％
E、81％
答案C
解析 在80人的班中，Mary的百分比是90％，也就是有8人的百分比高于Mary。在100人的班中，有19人的百分比高于Mary。那么两个班合并后，共有19+8=27人的百分比高于Mary，一共80+100=180，那么Mary在新班的百分比为(180-27)/180=85％。
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