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If the mean of the following distribution is 50, and the sum of all the frequencies is 40, then find the value of the frequencies \(a\) and \(b\).
 
Class interval\(20 - 30\)\(30 - 40\)\(40 - 50\)\(50 - 60\)\(60 - 70\)\(70 - 80\)
Frequency6\(a\)65\(b\)2
 
The value of the frequency \(a\) is .
 
The value of the frequency \(b\) is .