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1. Construct the network for aerospace launch project below and find out its critical path.

Activity TE (weeks) Preceding Activities
a 3 none
b 5 a
c 3 a
d 1 c
e 3 b
f 4 b, d
g 2 c
h 3 g, f
i 1 e, h

2. Resolve part (d) of problem 10 supposing the values of a and b are given at 95 percent level. Repeat, supposing the values are given at 90 percent level.

Activity* a m b
AB 3 6 9
AC 1 4 7
CB 0 3 6
CD 3 3 3
CE 2 2 8
BD 0 0 6
BE 2 5 8
DF 4 4 10
DE 1 1 1
EF 1 4 7

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