Question
Let the mean of the data
| $x$ | 1 | 3 | 5 | 7 | 9 |
|---|---|---|---|---|---|
| Frequency ($f$) | 4 | 24 | 28 | $\alpha$ | 8 |
be 5. If $m$ and $\sigma^{2}$ are respectively the mean deviation about the mean and the variance of the data, then $\frac{3 \alpha}{m+\sigma^{2}}$ is equal to __________
Correct Answer
8