46,41,43,39,37,34分别减去40,得6,1,3,-1,-3,-6,它们的和为0,所以x1+x2=40×2=80.
x1+x2+46+41+43+39+37+34=40*8=320x1+x2=320-(46+41+43+39+37+34)x1+x2=80
x1,x2,46,41,43,39,37,34的平均数为40x1+x2+46+41+43+39+37+34 =320x1+x2=80