Answer :

To find mean using step-deviation method, we need to create a table showing frequencies, midpoints and deviations.


Observe that class size, h = (30 – 0) = (60 – 30) = … = (150 – 120) = 30



We have,


A = 75


∑fiui = 2


∑fi = 80


h = 30


By step deviation method, we can give the formula of mean as:



Using the above values, we have







Mean = 75.75


Thus, mean is 75.75.

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