Question

The following table gives the number of children of 150 families in a village

No. of children (x):	0	1	2	3	4	5
No. of families (f):	10	21	55	42	15	7

Find the average number of children per family

Answer 1

Let the assume mean be.

We know that mean,

Now, we have

Putting the values above in formula, we get

Hence, the average number of children per family is 2.35.