One thousand stones were weighed, and the resulting measurements, in grams, are summarized in the following boxplot. If the 90th

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问题 One thousand stones were weighed, and the resulting measurements, in grams, are summarized in the following boxplot. If the 90^th percentile of the measurements is 135 grams, about how many measurements are between 126 grams and 135 grams?

选项 A、90
B、100
C、150
D、200
E、250

答案C

解析本题考查四分位数和百分位数的问题。1000块石头称重，第90个百分位数(90％)对应的数据是135克，从箱线图中得出Q3对应的数据是126克。根据Q3(四分位数中第三个分位)是第75个百分位数，即数据126克对应75％，可以得出(90％-75％)×1000=150，所以答案为C选项。

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本试题收录于： GRE QUANTITATIVE题库GRE分类

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One thousand stones were weighed, and the resulting measurements, in grams, are summarized in the following boxplot. If the 90th

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