14. With regard to problem 13:

a. Find the standard deviation of the critical path.

b. What is the probability of completing the critical path in 2 days less than the expected duration?

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10 10 7, 10, 12 20 9, 11, 13 8,14,20 5, 9, 15 40 70 7, 10, 13 30 6, 15, 21 50 12, 15, 17 6,10,16 60 7,9, 13 80 9, 15, 18 90 3,7,11 12, 16, 25