Project Op management

The following represents a project that shouldbe scheduled using CPM:

Time (DAYS)
Activity Immediate Predecessors a m b
A - 1 3 5
B - 1 2 3
C A 1 2 3
D A 2 3 4
E B 3 4 11
F C, D 3 4 5
G D, E 1 4 6
H F, G 2 4 5
a. Draw the network
b. What is the critical path?
c. what is the expected project completion time?
d. What is the probability of completing this project within 16days?