三个数70.2,0.27,ln0.2从大到小的顺序是( )
A:70.2,0.27,ln0.2
B:70.2,ln0.2,0.27
C:0.27,ln0.2,70.2
D:ln0.2,70.2,0.27
已知一组正数x1,x2,x3,x4的方差为S2=14x12+x22+x32+x42-16,则数据x1+2,x2+2,x3+2,x4+2的平均数为( )
观察下面一列数﹣1,2,﹣3,4,﹣5,6…根据规律,第2015个数是____.