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Find the mean of the following data using the assumed mean method.
 
Class interval\(10 - 15\)\(15 - 20\)\(20 - 25\)\(25 - 30\)\(30 - 35\)
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.)