Mean, Median and Mode · Example 7

Refer again to the frequency distribution of the number of siblings people who attended a conflict resolution class reported:
$$\begin{array}{cc}\text{Number of Siblings}& \text{Frequency}\\ \text{0}& \text{5}\\ \text{1}& \text{13}\\ \text{2}& \text{6}\\ \text{3}& \text{3}\\ \text{4}& \text{2}\\ \text{5}& \text{1}\end{array}$$

What is the mean of the number of siblings?

OpenStax, Contemporary Mathematics · §8.3 Mean, Median and Mode · Example 7