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