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Find mean by Direct method.
 
Class interval \(10-25\) \(25-40\) \(40-55\) \(55-70\) \(70-85\) \(85-100\)
Number of students \(2\) \(3\) \(7\) \(6\) \(6\) \(6\)
 
The mean of the given data is .