Question

一组数 92 93 94 99 94.5 93的方差是多少?

Answer 1

首先计算平均数：(92 +93+ 94 +99+ 94.5 +93)/6=94.25

方差=[(92-94.25)^2+(93-94.25)^2+(94-94.25)^2+(99-94.25)^2+(94.5-94.25)^2+(93-94.25)^2]/6=5.146