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
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