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Gaokao Math Practice Question

演讲比赛共有 9 位评委分别给出某选手的原始评分, 评定该选手的成绩时, 从 9 个原 始评分中去掉 1 个最高分、 1 个最低分, 得到 7 个有效评分. 7 个有效评分与 9 个原始评分 相比, 不变的数字特征是

  1. A.中位数
  2. B.平均数
  3. C.方差
  4. D.极差

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