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Calculate the mean of the following observations using the direct method.
 
Class interval\(5 - 20\)\(20 - 35\)\(35 - 50\)\(50 - 65\)\(65 - 80\)\(80 - 95\)\(95 - 110\)\(110 - 125\)
Frequency164424161392
 
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.)