The times taken for the calls are: 9, 2, 3, 1, and 5 minutes.
\[ 9 + 2 + 3 + 1 + 5 = 20 \text{ minutes} \]
The number of calls is 5. Thus, the average time per call is:
\[ \frac{20}{5} = 4 \text{ minutes} \]
Thus, the average time per call is 4 minutes.