Activity	Immediate predecessors	Expected Completion Time (week)
		Optimistic	Most likely	pessimistic
A	-	2	4	6
B	-	3	5	6
C	-	2	3	4
D	B	4	6	10
E	A,B	3	4	6
F	B	1	2	3
G	F,C	2	5	7
H	G	2	4	5
I	F	1	3	4
J	I,D	2	3	8
K	J	1	1	1
L	E,K	4	8	10

1. Calculate the estimated time for each activity.
2. Show the network for this project using activity-on-arrow method.
3. What are the critical path activities and the expected project completion time?

Show the activity schedule and slack for each activity.