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一、选择题 1.数据8,10,12,9,n的平均数和方差分别是(). A .10和、拒B.10和2 C.50和入恤D.50和2 2一组数据按从小到大排列为1,2,4,%,6,9.这组数据的中位数为5,那么这组数据的众数为(). A .4 B.5 C.55 D.6 3.如图1,从A地到C地,可供选择的方案是走水路、走陆路、走空中.从A地到B
First, multiple-choice questions 1. The average and variance of the data 8, 10, 12, 9, n are (). A.10, and B.10 and 2 C.50, and D.50 and 22, respectively. The group data is ranked from 1,2,4,%,6,9. The median of this group of data is 5, then the mode of the data is (). A.4 B.5 C.55 D.6 3. As shown in Figure 1, from A to C, the alternatives are to take the waterway, take the land and take the air. From A to B