题目
题型:不详难度:来源:
A.
| B.
| C.
| D.1 |
答案
. |
x |
1 |
9 |
方差为=
1 |
5 |
20 |
3 |
故标准差为:
|
2
| ||
3 |
故选:B.
核心考点
举一反三
甲:9.4 9.0 9.4 9.0 8.6 10.2 8.8 9.4 10.2 9.0
乙:9.0 9.0 9.4 9.8 9.0 8.6 9.0 9.4 10.4 9.4
哪个队60m跑的成绩较稳定?
A.1 | B.2 | C.3 | D.4 |
A.15 | B.16 | C.17 | D.18 |
A.
| B.
| C.
| D.1 |
. |
x |
1 |
9 |
1 |
5 |
20 |
3 |
|
2
| ||
3 |
A.1 | B.2 | C.3 | D.4 |
A.15 | B.16 | C.17 | D.18 |