Activity	Immediate Predecessor	Optimistic (o)	Most Likely (m)	Pessimistic (p)	Mean time using (O+4*m+p)/6	Variance using ((p-o)/6)^2
A	---	2	5	8	5	1
B	---	5	5	5	5	.00
C	---	3	4	11	5	1.78
D	A, B	2	4	6	4	.44
E	B	1	3	5	3	.44
F	C	6	8	10	8	.44
G	D, E	2	6	10	6	1.78
					STD	1.79

What is the probability that the project will be completed between 3 days earlier and 3 days later than expected?