问题
填空题
一组数据2,3,2,3,5的方差是______.
答案
=(2+3+3+3+5)÷5=3,. x
S2=
[(2-3)2+(3-3)2+(3-3)2+(2-3)2+(5-3)2]=1.2.1 5
故填答案为1.2.
一组数据2,3,2,3,5的方差是______.
=(2+3+3+3+5)÷5=3,. x
S2=
[(2-3)2+(3-3)2+(3-3)2+(2-3)2+(5-3)2]=1.2.1 5
故填答案为1.2.