When the group discussion is nearing its end, make sure to it with important points. A. concludeB. lead C. avoid D. hold 答案:A有一个容量为66的样本,数据的分组及各组的频数如下:[11.5,15.5)2[15.5,19.5)4[19.5,23.5)9[23.5,27.5)18 [27.5,31.5)11[31.5,35.5)12[35.5,39.5)7[39.5,43.5)3 根据样本的频率分布估计,大于或等于31.5的数据约占( )
A、211B、13C、12D、23