五个数1,2,3,4,5的方差等于______

五个数1,2,3,4,5的方差等于______.
2025-12-25 06:00:31
推荐回答(1个)
回答1:

x
=
1
5
(1+2+3+4+5)=3,
S2=
1
5
[(1-3)2+(2-3)2+(3-3)2+(4-3)2+(5-3)2]=2.
故答案为:2.