Q. 234.0( 2 Votes )

In an annual exam

Answer :

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

Here, let A = 37.5 and h = 15

We have got

A = 37.5, h = 15, Σfi = 50 & Σfiui = 60

mean is given by

Thus, mean marks are 55.5.

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