3 Given the information about a project in the following tab

3- Given the information about a project in the following table:

                                                                 Estimated Duration (weeks)

Task

Predecessor

Optimistic Time

Most Likely Time

Pessimistic Time

A

-----

4

6

14

B

A

1

3

11

C

----

2

9

16

D

C

1

3

8

a.Find the expected duration of the project and its variance, according to the Classic PERT model.

b.Based on the Classic PERT model, what is the probability that the project will be completed within 13 weeks?

Solution