1. Scenario 2: A network consists of the following list. Times are given in weeks. (Keep two decimal place in your calculation)

Activity	Preceding	Optimistic	Probable	Pessimistic	Expected Time	Variance
A	--	5	11	14
B	-	3	3	9	4.00	1.00
C	--	6	10	14	10.00	1.78
D	A, B	3	5	7	5.00	0.44
E	B	4	6	11	6.50	1.36
F	C	6	8	13	8.50	1.36
G	D, E	2	4	6	4.00	0.44
H	F	3	3	9	4.00	1.00

(3 points) a. Calculate the expected duration and variance of activity A (Keep two decimal place in your calculation & show your calculation steps). (3 points) b. Calculate the duration of the placescritical path. (3 points) c. Calculate the project variance and project standard deviation (Keep two decimal place in your calculation & show your calculation steps). (6 points) d. Calculate the probability that the project will be completed in more than 28 weeks (Keep two decimal place in your calculation, e.g. X.XX% & show your calculation steps).