标准差是多少···求高手·5.38,5.11,4.26,5.02,4.75,4.61,5.65,5.32,5.55,4.65,4.86,3.78.共计12个数·······均值为5,.求标准差s.没有计算器在身边啊····算不出··

Question

标准差是多少···求高手·
5.38,5.11,4.26,5.02,4.75,4.61,5.65,5.32,5.55,4.65,4.86,3.78.
共计12个数·······均值为5,.求标准差s .没有计算器在身边啊····算不出··

Answer 1

.方差s^2=[(x1-x)^2+(x2-x)^2+.(xn-x)^2]/n =（0.0121+0.5476+0.0004+0.0625+0.1521+0.4225+0.1024+0.3025+0.1225+0.0196+1.4884）/12=3.377/12=0.2814
标准差=（s^20）^0.5=0.5315