Please fill the table. Expected time of A is 2.5 and H is 5. Variance of H is 2.25. Need help with the Optimistic, Most Likely, Pessimistic values.

13. Use the network diagram and the table to answer the following questions: \begin{tabular}{|c|c|c|c|c|c|} \hline ACTIVITY & OPTIMISTIC & \begin{tabular}{c} MOST \\ LIKELY \end{tabular} & PESSIMISTIC & \begin{tabular}{c} EXPECTED \\ TIME \end{tabular} & VARIANCE \\ \hlineA & 1 & 2.5 & & & 0.25 \\ \hlineB & N/A & N/A & N/A & 3 & 0.5 \\ \hline C & N/A & N/A & N/A & 5 & 0.7 \\ \hline D & N/A & N/A & N/A & 6 & 0.6 \\ \hlineE & N/A & N/A & N/A & 2 & 0.6 \\ \hlineF & N/A & N/A & N/A & 4.5 & 0.4 \\ \hlineG & N/A & N/A & N/A & 2 & 0.8 \\ \hlineH & 2 & 5 & 8 & & \\ \hline \end{tabular}