Job		Predecessors	Duration / weeks
			Optimistic a	Most Probable M	Pessimistic B
A	(1 2)		2	5	8
B	(1 3)	--	6	9	12
C	(1 4)	--	6	7	8
D	(2 5)	A	2	5	8
E	(3 5)	B	8	8	8
F	(5 6)	D, E	7	11	15
G	(4 - 6)	B, C	3	9	21
H	(6 7)	F, G	6	6	6
I	(7 8)	H	7	8	27

1) Calculate the project duration with 50% probability & indicate the critical path.

2) What is the probability for the next?

2.1) project will complete within 30 weeks?

2.2) project will complete within 60 weeks?

2.3) project will complete not less than 44 weeks and not more than 47 weeks?