平均数：E=3105/30=103.5

方 差：D=105.5833

标准差：σ=10.2753

标准差系数：V=σ/E=0.0992

计算公式如下：

E=[Σ(x:1->30) xi]/30 = 3105/30 = 103.5

D=[Σ(x:1->30) (xi-E)^2]/30 = 3167/30 = 105.5833

σ=√D = sqrt(105.2753) =10.2753

V=σ/E =10.2753/103.5 = 0.9992