The number of children in $10$ families of a locality are

           $2,4,3,4,2,0,3,5,1,6$.

 Find the mean number of children per family.

The following are the numbers of books issued in a school library during a week:

$105,216,322,167,273,405\text{ and }346$ 

Find the average number of books issued per day.

$\begin{array}{|cccccc|}\hline \text{ Monday }& \text{ Tuesday }& \text{ Wednesday }& \text{ Thursday }& \text{ Friday }& \text{ Saturday }\\ 35.5& 30.8& 27.3& 32.1& 23.8& 29.9\\ \hline\end{array}$

Find the mean of the given data.