Using the following project information

Activity		Optimistic Time Estimate(weeks)		Most Likely Time Estimates (weeks)		Pessimistic Time Estimates (weeks)		Immediate Predecessor(s)
A		2		3		5		none
B		2.6		4		5		A
C		5		7		8		A
D		3		5		8		B, C
E		4		6		13		B, C
F		2		5		8		D
G		4		5		7		E
H		6		6		9		F
I		4		8		11		G
J		2		3		3		H, I

The critical path is A-C-E-G-I-J.

Activity	A	B	C	D	E	F	G	H	I	J
Variance	0.25	0.16	0.25	0.69	2.25	1.00	0.25	0.25	1.36	0.03

(a) Calculate the probability that the project will be completed in 31 weeks. (Round your answer to 4 decimal places, e.g. 1.7945.)

P(project 31) =

(b) Calculate the probability that the project will be completed in 35 weeks. (Round your answer to 4 decimal places, e.g. 1.7945.)

P(project 35) =

please explain your answer