1.
A
D
lB
E
I
K
L
F
J
H
G
C
2 a.
H
A
D
I
J
E
B
C
b. Critical activities – A, E, G, J, K, L
c.
d. 180
3a. Expected time = [OP +4(MS) + P]/6
=[ 11+4(17)+30]/6
F
G
K
L
=18.17
b. Critical activities – A, B, D, G
c. SD=[ P-O/6]^2
= [30-11/6]^2
=10.03
d. Z= 20-18.18/10.03
= 0.18