Consider the following work breakdown structure of Chiang's project:

Time Estimates (days)

Activity	Precedes	Optimistic			Most Likely			Pessimistic
Start	A,B		-			-			-
A	C,D		41			47			71
B	C		90			99			108
C	E,F		92			98			116
D	F		7			28			31
E	End		91			100			115
F	End		62			65			68

1) Use the given information, what is the expected (mean) time to complete the activity C?

2) Use the given information, what is the variance of the activity C?

3) Use the given information, what is the expected duration for path A-D-F?

4) Used the expected time of an activity to create an activity on node (AON) network diagram, what is the slack of the activity A?

5) Use the given information, what is the expected (mean) time for project completion?