4. TBQ - Step deviation method

Find mean by Step deviation method.
 
Class interval \(10-25\) \(25-40\) \(40-55\) \(55-70\) \(70-85\) \(85-100\)
Number of students 1 4 5 10 11 11
 
Mean \(=\)
 
(Round off to nearest whole number)
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