x拔=(0.38+0.38+0.42+0.52+0.69+0.33+0.44+0.44+0.57+0.75)/10=0.492
S²=Sqr(∑(xn-x拨)²/(n-1))=Sqr(∑(x10-x拨)²/(10-1))=Sqr【(0.38-0.492)²+（0.38-0.492)²+（0.42-0.492）²+（0.52-0.492）²+（0.69-0.492）²+（0.33-0.492）²+（0.44-0.492）²+（0.44-0.492）²+（0.57-0.492）²+（0.75-0.492）²】/9
计算结果自己算吧,我帮你做到这里已经算是仁至义尽了