Q. 18 3.7( 3 Votes )

Find the mean of the following frequency distribution using step - deviation method:

Answer :

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

Here, let A = 99 and h = 6

Since, the class intervals are inclusive type, we’ll first convert it into exclusive type by extending the class interval from both the ends.

We have got

A = 99, h = 6, Σfi = 120 & Σfiui = 81

mean is given by

Thus, mean is 103.05.

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