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Find the mean of the following data using the assumed mean method.
 
Class interval10 - 1515 - 2020 - 2525 - 3030 - 35
Frequency4111366
 
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.)
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