3,-1,2,x,1,4的平均数为1
x=1*6-3+1-2-1-4=-3
方差
=1/6*[(3-1)²+(-1-1)²+(2-1)²+(-3-1)²+(1-1)²+(4-1)²]
=1/6*34
=34÷6
=17/3
标准差
=√(17/3)
=√51/3
3,-1,2,x,1,4的平均数为1
x=1*6-3+1-2-1-4=-3
方差
=1/6*[(3-1)²+(-1-1)²+(2-1)²+(-3-1)²+(1-1)²+(4-1)²]
=1/6*34
=34÷6
=17/3
标准差
=√(17/3)
=√51/3