The number of children in 10 families of a locality are

Numbers of children in 10 families = 2, 4, 3, 4, 2, 0, 3, 5, 1 and 6.
Thus, we have:

Mean $=\frac{\text { Sum of observa tions }}{\text { Number of observations }}$

$=\frac{2+4+3+4+2+0+3+5+1+6}{10}$

$=\frac{30}{10}$

$=3$