To find the deviation of a data point from the mean, you can use the formula:
\[ \text{Deviation} = \text{Data Point} - \text{Mean} \]
In this case, the mean is 9.25 and the data point is 12.
\[ \text{Deviation} = 12 - 9.25 = 2.75 \]
So the deviation of the data point 12 from the mean 9.25 is 2.75.