draw the AON diagram; find the critical path and the expected project completion time. Then compute the probability of completing the project in (i) 21 days; (ii) 22 days; and (iii) 25 days.

Expected time (optimistic + 4x monthly + Pessimistic) / 6

Task	a	m	b	Expected	Variance	Std Dev.
A	6.5	7.5	14.5	8.5	1.77	1.33
B	8.5	10.5	12.5	10.5	.45	.67
C	2.5	3.5	4.5	3.5	.11	.33
D	6.5	7.5	8.5	7.5	.11	.33
E	5.5	5.5	9.5	6.2	.45	.67
F	5.5	7.5	9.5	7.5	.45	.67
G	4.5	6.5	8.5	6.5	.45	.67
H	2.5	3.5	3.5	3.3	.03	.17

Activity	Predecessors
Start	None
A	Start
B	Start
C	A
D	A
E	B, C
F	B, C
G	D, E
H	F
End	G, H