A network consists of the following list. Times are given in weeks.

Activity	Preceding	Optimistic	Probable	Pessimistic
A	--	6	8	10
B	-	3	9	15
C	--	6	8	10
D	A, B	4	8	12
E	B	4	6	8
F	C	6	6	6
G	D, E	2	6	10
H	F	3	6	9

1. Calculate the expected duration and variance of each activity.

Activity	Preceding	Opt.	Prob.	Pes.	Expected Time	Variance	ES	EF	LS	LF	Slack	CPVar
A	--	6	8	10
B	-	3	9	15
C	--	6	8	10
D	A, B	4	8	12
E	B	4	6	8
F	C	6	6	6
G	D, E	2	6	10
H	F	3	6	9
											Total
											Std. Dev.

2. Calculate the expected duration and variance of the critical path.

3. Calculate the probability that the project will be completed in less than 26 weeks.