∴
x1+x2+x3+ x4+x5 |
5 |
∴3x1-2,3x2-2,3x3-2,3x4-2,3x5-2,的平均数是
(3x1−2)+(3x2−2)+(3x3−2)+(3x4−2)+(3x5−2) |
5 |
x1+x2+x3+ x4+x5 |
5 |
方差是:
1 |
3 |
∴数据3x1-2,3x2-2,3x3-2,3x4-2,3x5-2的平均数是4,方差是3.
1 |
3 |
x1+x2+x3+ x4+x5 |
5 |
(3x1−2)+(3x2−2)+(3x3−2)+(3x4−2)+(3x5−2) |
5 |
x1+x2+x3+ x4+x5 |
5 |
1 |
3 |