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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.

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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

Σfi = 84

Σfixi = 144

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

Mean = 1.714285

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