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  3. The median score for the class is [br] If 5 points were added to each score, whi

The median score for the class is [br] If 5 points were added to each score, whi

游客2024-01-12  20
问题 The median score for the class is [br] If 5 points were added to each score, which of the following would NOT be affected?
选项 A、The highest score
B、The mean for all scores
C、The median for the seniors’ scores
D、The mode for the juniors’ scores
E、The standard deviation for all scores
答案 E
解析 每个分数加5分，下面哪一个数将不受加分的影响?
解：本题的正确答案是(E)。每个分数加5分后，最高分显然加了5分，平均分相应也高了5分，同理大学四年级学生分数的中数也增加5分。“mode”是指出现频率最高的数，本题为76，加了5分之后，mode将变为81分，根据标准方差的计算公式可知，“Standard deviation”在加分前后是不变的。
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