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Find the mean of the distribution :
 
 Class \(1-3\) \(3-5\)  \(5-7\)  \(7-10\) 
 Frequency \(9\)  \(22\)  \(27\)
 \(17\)
 
Answer:  
 
The mean is .
 
[Note: Enter the answer in to two decimal number.]