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$4$. Ages in a class: $11,12,12,12,12,12,13$$\newline$$5$. Movies $\mathrm{s}$$\newline$Find the mean of the data.$\newline$($1$) $6$. \begin{tabular}{|c|c|}$\newline$\hline Pets Owned \\$\newline$Brandon & I \\$\newline$Jill & III \\$\newline$Mark & II \\$\newline$Nicole & IIII \\$\newline$Steve & $0$ \\$\newline$\hline$\newline$\end{tabular}$\newline$$7$.$\newline$$8$.$\newline$\begin{tabular}{|c|c|c|}$\newline$\hline \multicolumn{$3$}{|c|}{ Sit-ups } \\$\newline$\hline $108$ & $85$ & $94$ \\$\newline$\hline $103$ & $112$ & $115$ \\$\newline$\hline $98$ & $119$ & $126$ \\$\newline$\hline $105$ & $82$ & $89$ \\$\newline$\hline$\newline$\end{tabular}$\newline$$9$.