Question
Mathematics Question on Mean Deviation
| Let the mean and variance of the frequency distributionxi | 2 | 4 | 6 | 8 | 10 | 12 | 14 | 16 |
|---|---|---|---|---|---|---|---|---|
| fi | 4 | 4 | α | 15 | 8 | β | 4 | 5 |
| are 9 and 15.08 respectively, then the value of α2+β2-αβ is ____. |
\
Answer
The correct answer is: 25
| Let the mean and variance of the frequency distributionxi | 2 | 4 | 6 | 8 | 10 | 12 | 14 | 16 |
|---|---|---|---|---|---|---|---|---|
| fi | 4 | 4 | α | 15 | 8 | β | 4 | 5 |
| are 9 and 15.08 respectively, then the value of α2+β2-αβ is ____. |
\
The correct answer is: 25