摘要:4 8.4 9.4 9.9 9.6 9.4 9.7 去掉一个最高分和一个最低分后.所剩数据的平均值和方差分别为( ) A.9.4 ,0.484 B.9.4 ,0.016 C.9.5 ,0.04 D.9.5 ,0.016 答案:D

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