Activity	Expected Time	Standard Deviation of Time Estimate	Immediate Predecessor(s)
A	7	2	-
B	3	1	A
C	9	3	A
D	4	1	B, C
E	5	1	B, C
F	8	2	E
G	8	1	D, F
H	6	2	G

a) Find the critical path and project completion time.

b) Find the probability that the project will take more than 49 time periods to complete.