Analyzing the given project times- CPM and PERT

Hello,

I need some assistance on my homework on the following AON diagrams. I have attached the word document and a jpeg what I've done so far. I need assistance on the second problem.

1) Given the information in the following table:
Activity Duration Predecessor
A 4 None
B 6 A
C 4 A
D 2 C
E 4 B
F 5 B, D
G 3 C
H 4 F, G
I 2 E, H

a) Construct the AON network diagram
b) Find each activity's ES, EF, LS and LS
c) Identify all paths. Which path is the critical path?
d) Calculate the slack for each activity.
e) How long will it take to complete the project?

2) In the following table task durations are given in weeks. Use the three point to find:

Activity Predecessor Optimistic Normal Pessimistic
A None 2 4 6
B None 3 5 9
C A 4 5 7
D A 4 6 10
E B,C 4 5 7
F D 3 4 8
G E 3 5 8
a) Construct the AON network diagram
b) Find each activity's ES, EF, LS and LS
c) Identify all paths. Which path is the critical path?
d) Calculate the slack for each activity.
e) How long will it take to complete the project?

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