The table that continues presents the estimated times for the construction project of a plant.

1. Calculate Critical Path

2. Find the probability that the project will be completed in four years.

3. Find the probability that it will take more than 55 months.

4. In how many months will we finish the project with a 95% certainty.

m Description Design plant Select site Select seller Select personnel Prepare the site Generator Manufacturing Prepare Handbook Install generator Train operators Obtain license for plant Activity 1-2 2-3 2-4 2-6 3-5 4-5 4-6 5-7 6-7 7-8 Times Estimated In months a b 10 12 16 2 8 36 1 4 5 2 3 4 8 12 20 15 18 30 3 5 8 2 4 8 6 9 12 4 6 14