平均数:(0.1+0.2+0.3+0.4+0.5)/5
=(1/10+2/10+3/10+4/10+5/10)/5
=15/10 X 1/5
=3/10=0.3
方差:(0.1-0.3)²+(0.2-0.3)²+(0.3-0.3)²+(0.4-0.3)²+(0.5-0.3)²=0.1
两者相比方差越小就越好,越稳定
平均数:(0.1+0.2+0.3+0.4+0.5)/5
=(1/10+2/10+3/10+4/10+5/10)/5
=15/10 X 1/5
=3/10=0.3
方差:(0.1-0.3)²+(0.2-0.3)²+(0.3-0.3)²+(0.4-0.3)²+(0.5-0.3)²=0.1
两者相比方差越小就越好,越稳定