plz need help for 3-7

\begin{tabular}{|l|rrr|} \hline \multicolumn{1}{|c|}{ 2. bell } & \multicolumn{2}{l}{ bmo } & \multicolumn{2}{c|}{ enbridge } \\ \hlineE(r) & 0.1078% & 0.0719% & 0.2695% \\ \hline Var(r) & 0.18139841 & 0.53080057 & 0.3700212 \\ \hline risk & 0.42590892 & 0.72929027 & 0.60890289 \\ \hline \end{tabular} \[ \begin{array}{|c|c|} \hline \multicolumn{1}{|c|}{7 .} \\ \hline \mathrm{M} & 0.5192 \\ \hline & 0.6466 \\ \hline & 0.1658 \\ \hline \end{array} \] daily annual E(Rm) Var(Rm) Sigm