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Each of the following frequency tables represents a data set. Which data set has the greatest mean?<br/><br/>$\begin{tabular}{|c|c|} \hline \begin{tabular}{c} \textbf{Value} \\ \end{tabular} & <br/>\begin{tabular}{c} \textbf{Frequency} \\ \end{tabular} \\ \hline<br/>70 & 4 \\ \hline<br/>80 & 5 \\ \hline<br/>90 & 6 \\ \hline<br/>100 & 7 \\ \hline \begin{tabular}{c} \textbf{Value} \\ \end{tabular} & <br/>\begin{tabular}{c} \textbf{Frequency} \\ \end{tabular} \\ \hline<br/>70 & 6 \\ \hline<br/>80 & 6 \\ \hline<br/>90 & 6 \\ \hline<br/>100 & 6 \\ \hline \begin{tabular}{c} \textbf{Value} \\ \end{tabular} & <br/>\begin{tabular}{c} \textbf{Frequency} \\ \end{tabular} \\ \hline<br/>70 & 7 \\ \hline<br/>80 & 6 \\ \hline<br/>90 & 6 \\ \hline<br/>100 & 7 \\ \hline \begin{tabular}{c} \textbf{Value} \\ \end{tabular} & <br/>\begin{tabular}{c} \textbf{Frequency} \\ \end{tabular} \\ \hline<br/>70 & 8 \\ \hline<br/>80 & 5 \\ \hline<br/>90 & 5 \\ \hline<br/>100 & 8 \\ \hline \end{tabular}$