A project has eight activities with their associated predecessors as given in the following table.

Construct the CPM/PERT network for this project and determine the project schedule. Identify the critical path and determine the expected project duration and variance of the critical path. What is the probability that the project will be completed within 25 days?

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Activity A B C D E F G H Activity predecessor B A с B, E E, D F, G Time estimate (days) m b a 2 3 2 3 2 2 4 2 3 4 5 4 7 8 3 10 5 12 435 5