Answer :

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


Observe that class size, h = (14 – 0) = (28 – 14) = … = (70 – 56) = 14



We have,


A = 35


∑fiui = 8


∑fi = 90


h = 14


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



Using the above values, we have






Mean = 36.24


Thus, mean is 36.24.

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