Q. 23 A5.0( 3 Votes )

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

Answer :

Let us first calculate the mid-values(xi) for each class-interval, By using the formula

Let us assume the assumed mean(a) = 75

and from that, we get the data as shown in above table.

And we know, By step-deviation method

Where, a = assumed mean

h = class size

Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.