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Question: aerorich llc manufactures and installs custom wire harnesses in commercial...

Question details

AeroRich, LLC manufactures and installs custom wire harnesses in commercial aircraft. Linda, the project manager, has been very concerned with the amount of time it took to complete several recent jobs. Some of her workers are very unreliable. A list of activities and their optimistic completion time, the most likely completion time, and the pessimistic completion time (all in days) for a new contract are given in the following table. To solve this problem, calculate the expected completion time and variance for each activity, draw a network diagram, complete a forward and backward pass, identify the critical path.What is the probability that AeroRich will finish the project in 40 days or less?

Activity

a

m

b

Immediate predecessor

A

3

6

8

-

B

2

4

4

-

C

1

2

3

-

D

6

7

8

C

E

2

4

6

B,D

F

6

10

14

A,E

G

1

2

4

A,E

H

3

6

9

F

I

10

11

12

G

J

14

16

20

C

K

2

8

10

H,I

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