Q. 255.0( 2 Votes )

Find the mean of

Answer :

We will find the mean of the frequency distribution using step - deviation method, where A = Assumed mean and h = length of class interval.

Here, let A = 25 and h = 10

We have got

A = 25, h = 10, Σfi = 50 & Σfiui = 4

mean is given by

Thus, mean is 25.8

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