activity	predecessors	optimistic	most likely	pessimistic	expected time (weeks)	variances (weeks^2)
A	---	4	7	10
B	A	2	8	20
C	A	8	12	16
D	B	1	2	3
E	D,C	6	8	22
F	C	2	3	4
G	F	2	2	2
H	F	6	8	10
I	E,G,H	4	8	12
J	I	1	2	3

a. Calculate the expected times and variances in the above table.

b. Draw a network and determine the critical path based on the expected completion times.

WILL GIVE LIKE, THANKS.