To find the deviation of a data point from the mean, you subtract the mean from the data point.
Given:
- Mean = 9.25
- Data Point = 9
The deviation is calculated as follows:
\[ \text{Deviation} = \text{Data Point} - \text{Mean} = 9 - 9.25 = -0.25 \]
So, the deviation of the data point 9 from the mean 9.25 is -0.25.