Suppose that the following estimates of activity times (in weeks) were provided for the network shown below:

What is the probability that the project will be completed. If required, round your answers to two decimal places:

Within 21 weeks?

Within 22 weeks?

Within 25 weeks?

\begin{tabular}{cccc} Activity & Optimistic & Most Probable & Pessimistic \\ A & 4.0 & 5.0 & 6.0 \\ B & 2.5 & 3.0 & 3.5 \\ C & 6.0 & 7.0 & 8.0 \\ D & 5.0 & 5.5 & 9.0 \\ E & 5.0 & 7.0 & 9.0 \\ F & 2.0 & 3.0 & 4.0 \\ G & 8.0 & 10.0 & 12.0 \\ H & 6.0 & 7.0 & 14.0 \end{tabular}