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Calculate the mean of the following observations using assumed mean method.
| Age | 4 | 18 | 22 | 9 | 1 | 12 | 14 | 25 |
| Frequency | 19 | 4 | 7 | 23 | 16 | 14 | 9 | 4 |
The mean of the 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.)
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