Q23 of 40 Page 422

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

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




More from this chapter

All 40 →
21

ΔABC and ΔDBC are on the same base BC and on opposite sides of BC. If O is the point of intersection of BC and AD, prove that:


 22

In Δ ABC, the AD is a median and E is the midpoint of the AD. If BE is produced to meet 1 AC in F, show that AF = 1/3 AC.

 23

The mean of the following frequency distribution is 24. Find the value of p.

 24

Find the median of the following data: