What is approximate probability that the job as per critical path will be completed in 24 days?

The following table lists the jobs of a network along with their time estimates.

Activity T0 (Days) TM (Days) TP (Days)
1 - 2 1 3 5
1 - 3 2 5 6
2 – 4 4 6 7
2 - 5 8 10 12
3 - 5 0 0 0
3 - 6 4 8 9
4 - 7 5 7 14
5 - 7 7 10 16
6 - 7 0 0 0
6 - 8 6 9 12
7 - 9 1 3 7
8 - 9 3 5 7

i) Draw the project network
ii) Calculate the length and variance of the critical path.
iii) What is approximate probability that the job as per critical path will be completed in 24 days?




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