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COMPARISON OF TEST SCORES FOR TWO CLASSES[img]ct_4image004[/img]Column A
COMPARISON OF TEST SCORES FOR TWO CLASSES[img]ct_4image004[/img]Column A
游客
2025-02-24
8
管理
问题
COMPARISON OF TEST SCORES FOR TWO CLASSES
Column A Column B
The mean of the 45 scores The median of the 45 scores
选项
A、if the quantity in Column A is greater
B、if the quantity in Column B is greater
C、if the two quantity are equal
D、if the relationship cannot be determined from the information given
答案
D
解析
标题:两个班级考试分数的比较解:本题的正确答案是(D)。根据平均值(mean)与中数(median)的定义可知,它们两者之间不存在任何确定的关系。本题只可以算出左项,但无法得出右项,但右项必然小于或等于84,如果左项大于84,则选(A),但如果小于或等于84,则无法判断,左项为:(15×80+30×74) / 45 = 76
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