Homework Answers
Answer a=
| Activity | ES | EF | LS | LF | Slack |
| A | 0 | 5 | 0 | 5 | 5-5=0 |
| B | 0 | 3 | 2 | 5 | 5-3=2 |
| C | 5 | 12 | 7 | 14 | 14-12=2 |
| D | 5 | 11 | 5 | 11 | 11-11=0 |
| E | 3 | 10 | 5 | 12 | 12-10=2 |
| F | 11 | 14 | 11 | 14 | 14-14=0 |
| G | 11 | 21 | 12 | 22 | 22-21=1 |
| H | 14 | 22 | 14 | 22 | 22-22=0 |
Answer B= Critical path = activity with zero slack
Critical path =A-D-F-H
Project duration =5+6+3+8=22
Answer c=
| Activity | O | M | P | Duration | Duration | Variance | Variance |
| A | 3 | 5 | 7 | (3+4*5+7)/6 | 5 | ((7-3)/6))^2 | 0.44 |
| D | 2 | 6 | 10 | (2+4*6+10)/6 | 6 | ((10-2)/6))^2 | 1.78 |
| E | 4 | 7 | 10 | (4+4*7+10)/6 | 7 | ((10-4)/6))^2 | 1 |
| F | 1 | 3 | 5 | (1+4*3+5)/6 | 3 | ((5-1)/6))^2 | 0.44 |
The new project duration= B-E-G=3+7+10=20
Variance =1
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