The question is as follows:

Calculate the probability that the project will take longer than 13 weeks to complete:

There are 5 activities that are independent from one another, A, B, C, D, E

Activity Expected Duration

A 10

B 8

C 12

D 15

E 13

I have calculated the probabilities of completion using given variance and Z table as:

Activity Probability of completion in 13 weeks or under

A 0.9968

B 0.9999

C 0.8413

D 0.1190

E 0.2033

**What is the probability that the project will take longer than 13 weeks to complete?**