The Following Table Gives the Number of Pets Owned for a Population

Essay

The following table gives the number of pets owned for a population of four families. $$\begin{array} { | l | c | c | c | c | } \hline \text { Family } & \text { A } & \text { B } & \text { C } & \text { D } \\\hline \text { Number of pets owned } & 2 & 1 & 4 & 3 \\\hline\end{array}$$ List all possible samples of two families that can be selected without replacement from this population, and compute the sample mean $\bar { x }$ for each sample.