GoodFriend Inc What Is the Probability That the Project Can Be Completed

GoodFriend Inc.plans to upgrade its accounting software.The main activities for the project are:A.Evaluate available products.
B.Determine the hardware requirements.
C.Order and obtain the hardware.
D.Order and obtain the software.
E.Set up the hardware.
F.Train the IT staff to implement and support the software.
G.Train the end users.
H.Install the software.
I.Customize the software.
J.Test the system.
The following table indicates the PERT estimates in work days.
$\begin{array}{ccccc}\text { Job}&\text { Predecessors}&\text {optimistic}&\text { Most Likely}&\text { Pessimistic }\\\text { A } & -- & 10 & 20 & 30 \\\text { B } & -- & 2 & 3 & 5 \\\text { C } & \text { B } & 5 & 8 & 10 \\\text { D } & \text { A } & 3 & 5 & 10 \\\text { E } & \text { C } & 1 & 2 & 4 \\\text { F } & \text { D } & 5 & 7 & 15 \\\text { G } & \text { D } & 5 & 7 & 15 \\\text { H } & \text { E, F } & 1 & 2 & 4 \\\text { I } & \text { H } & 15 & 20 & 30 \\\text { J } & \text { G. I } & 4 & 10 & 15\end{array}$
What is the probability that the project can be completed in 65 work days?