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Find the mean of the following data using the assumed mean method.
Class interval | 10 - 15 | 15 - 20 | 20 - 25 | 25 - 30 | 30 - 35 |
Frequency | 4 | 11 | 13 | 6 | 6 |
The mean for the given data is .
(Note: If the answer is a whole number, write as it is. If not, round off the answer to 2 decimal places and provide the answer.)