please include unites and appropriate sig figs, thanks!

Data Table \begin{tabular}{||c||c||c||c|c|} \hline \begin{tabular}{|c||c|c|} \hline Data \\ Point \end{tabular} & A (g) & B (g) & C (g) & D (g) \\ \hline \hline 1 & 2.362 & 4.382 & 7.590 & 9.627 \\ \hline \hline 2 & 2.936 & 3.928 & 7.241 & 9.019 \\ \hline \hline 3 & 2.125 & 4.117 & 7.002 & 9.420 \\ \hline \hline 4 & 2.418 & 3.813 & 6.998 & 8.925 \\ \hline \end{tabular} What is the average for data set B ? What is the standard deviation for data set C? According to your lab manual, which data set is the most precise