Activity	Min duration	Most likely	Max duration	Predecessors
A Requirements analysis	2 months	3 months	4 months	None
B Programming	6 months	7 months	9 months	A
C Hardware acquisition	3 months	3 months	3 months	A
D Train users	12 months	12 months	12 months	A
E Implementation	3 months	5 months	7 months	B, C
F Testing	1 month	1 month	2 months	E

Conduct a PERT analysis and identify expected completion time for each activity.

Calculate the probability of completing the project in the following periods:

18 months, 17 months, 16 months, 15 months