Consider the following data for another project

What is the probability that the project will be done in 28 days or less?

Assuming each activity can be crashed at least two days, what is the cost to reduce the expected project duration by 2 days? Which activities would be crashed?

\begin{tabular}{|c|c|c|c|c|} \hline Activity & Predecessor & t & 2 & Crash Costiday, \\ \hline A & - & 11 & 2 & 6 \\ \hline B & - & 7 & 1.5 & 5 \\ \hline C & - & 12 & 2 & 10 \\ \hline D & A.B & 5 & 1.5 & 15 \\ \hline E & C & 15 & 0.1 & 12 \\ \hline F & D & 10 & 2.5 & 16 \\ \hline \end{tabular}