Twenty-nine cities provided information on vacancy rates (in percent) for local apartments in the following frequency distribution.

Vacancy Rate (in percent) | Frequency
0 up to 3 | 7
3 up to 6 | 4
6 up to 9 | 8
9 up to 12 | 5
12 up to 15 | 5

Calculate the average vacancy rate. (Round your answer to 4 decimal places.)