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答案：
A
一个6天的sh
ow，来的最少的一天是80人，问这6天平均每天过来的人是不是大于90?
（1）签到人数最多的4天，平均下来每天有100人，那么一共最少过来了100*4+80*2=560，平均每天560/6>90，充分；
（2）签到人数最少的3天，平均下来每天有85人，那么85*3=255,那么剩下的两天平均（255-80）/2=87.5，也就意味着，倒数三天的状况可能是80 87 88，比它多的人数，如果只是88 89这样的数字，那么6天的平均数不会超过90，但如果是100,110这样的数学，平均数就可能超过90，所以无法判断
选A 
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