The numbers of children in 10 families of a locality are 2, 4, 3, 4, 2, 3, 5, 1, 1, 5. Find the mean number of children per family.
Given:
The number of children in 10 families of a locality are:
2, 4, 3, 4, 2, 3, 5, 1, 1, 5.
To do:
We have to find the mean number of children per family.
Solution:
We know that,
Mean $\overline{X}=\frac{Sum\ of\ the\ observations}{Number\ of\ observations}$
Therefore,
Mean number of children $\overline{X}=\frac{2+4+3+4+2+3+5+1+1+5}{10}$
$=\frac{30}{10}$
$=3$
Hence, the mean number of children per family is $3$.
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