Find the mean number of children per family.

Question

Number of families In a village in correspondence with the number of children are given below.

No of children	0	1	2	3	4	5
No of families	11	25	32	10	5	1

Find the mean number of children per family.

Answer 1

No. of children xi	No. of families fi	x1fi
0	11	0
1	25	25
2	32	64
3	10	30
4	5	20
6	1	5

Σf_i = 84

Σf_ix_i = 144

\(\overline x = \frac {\sum f_ix_i}{\sum f_i} = \frac {144}{84}\)

Mean = 1.714285