摘要： 解:(1)21··········································································································· 2分 (2)一班众数为90.二班中位数为80·········································································· 6分 (3)①从平均数的角度看两班成绩一样.从中位数的角度看一班比二班的成绩好.所以一班成绩好, 8分 ②从平均数的角度看两班成绩一样.从众数的角度看二班比一班的成绩好.所以二班成绩好, 10分 ③从级以上(包括级)的人数的角度看.一班人数是18人.二班人数是12人.所以一班成绩好． 12分

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