求一组数据的标准偏差,数列:0.38,0.38,0.42,0.52,0.69,0.33,0.44,0.44,0.57,0.75

问题描述:

求一组数据的标准偏差,
数列:0.38,0.38,0.42,0.52,0.69,0.33,0.44,0.44,0.57,0.75

A组为3.5960240389755B组为2.57450103040539标准偏差公式:S = Sqr(∑(xn-x拨)^2 /(n-1))公式中∑代表总和x拨代表x的算术平均值gk^2代表二次方,Sqr代表平方根406

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