The Widget Company is planning to manage a small R&D project with PERT. The following information has been estimated.

a. Draw the network diagram.
b. Calculate the expected time and variance for each activity.
c. What are the expected completion time and variance for the entire project.
d. What is the probability that the project completion time will be less than 25?

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Immediate Predecessor Activity None 12 A and C B and D E and C Fand E