To find the deviation of a data point from the mean, you subtract the mean from the data point.
Given:
- Mean = 9
- Data point = 13
The deviation can be calculated as follows:
\[ \text{Deviation} = \text{Data point} - \text{Mean} \]
Substituting in the given values:
\[ \text{Deviation} = 13 - 9 = 4 \]
So, the deviation of the data point 13 from the mean 9 is 4.