题目内容
已知一个样本:1,2,3,4,5,6.这个样本的方差是______.
这组样本的平均值为
=
(1+2+3+4+5
+6)=-
方差S2=
[(1-
)2+(2-
)2+(3-
)2+(4-
)2+(5-
)2+(5-
)2]=
故答案为:
.
| . |
| x |
| 1 |
| 6 |
+6)=-
| 7 |
| 3 |
方差S2=
| 1 |
| 6 |
| 7 |
| 3 |
| 7 |
| 3 |
| 7 |
| 3 |
| 7 |
| 3 |
| 7 |
| 3 |
| 7 |
| 3 |
| 35 |
| 12 |
故答案为:
| 35 |
| 12 |
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