The Petaluma Poultry Company is expanding its operations to include a new drive-in weigh station. The weigh station will be a heated/air-conditioned building with a large floor and small office. The large room will have the scales, a 15 foot counter, and several display cases for its equipment.
Before erection of the building, the project manager evaluated the project using PERT analysis. The activities with their corresponding times were recorded in the table below:
|
Times (in days)
|
|
|
#
|
Activity
|
Optimistic
|
Most likely
|
Pessimistic
|
Predecessor(s)
|
|
A
|
Lay foundation
|
8
|
10
|
13
|
--
|
|
B
|
Dig hole for scale
|
5
|
6
|
8
|
--
|
|
C
|
Insert scale bases
|
13
|
15
|
21
|
B
|
|
D
|
Erect frame
|
10
|
12
|
14
|
A,C
|
|
E
|
Complete building
|
11
|
20
|
30
|
D
|
|
F
|
Insert scales
|
4
|
5
|
8
|
E
|
|
G
|
Insert display cases
|
2
|
3
|
4
|
E
|
|
H
|
Put in equipment
|
4
|
6
|
10
|
G
|
|
I
|
Finishing touches
|
2
|
3
|
4
|
F,H
|
Using PERT analysis, draw the diagram and find:
(1) The Critical Path
(2) Any slack times(These would be for the non critical activities.)
(3) The expected completion time