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

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 90th 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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