In: Statistics and Probability
Using the following data for questions below.
| 
 Activity  | 
 Time (hrs)  | 
 Pred 1  | 
 Pred 2  | 
 Pred 3  | 
| 
 A  | 
 2  | 
|||
| 
 B  | 
 7  | 
|||
| 
 C  | 
 15  | 
 A  | 
 B  | 
|
| 
 D  | 
 18  | 
 A  | 
 B  | 
|
| 
 E  | 
 6  | 
 A  | 
 B  | 
|
| 
 F  | 
 5  | 
 C  | 
 D  | 
 E  | 
| 
 G  | 
 5  | 
 C  | 
 D  | 
 E  | 
| 
 H  | 
 7  | 
 E  | 
 F  | 
|
| 
 I  | 
 9  | 
 E  | 
 F  | 
|
| 
 J  | 
 12  | 
 H  | 
 I  | 
What is the expected project completing time?
A. 86 hrs
B. 51 hrs
C. 65 hrs
D. 34 hrs
What is the critical path?
A. Activities: B, D, F, I, J
B. Activities: A, B, C, D, E, F, G, H, I, J
C. Activities: B, C, F, I, J
D. Activities: B, D, E, F, G, I, J
How much slack does activity A have?
A. none
B. 5
C. 3
D. 2
What is the earliest start time for activity J?
A. 39
B. 51
C. 30
D. 32
network diagraom us shown below:

Q-A) Expected project completion time = 51hrs.
Option - B
Q-B)
Duble line shows critical path, ES=LS & EF = LF
Critical path is B-D-F-I-J
Option -A
Q-C)
Slack of activity A
Slack of the activity = LF-EF = 7-2 =5
Slack of the activity = LS-ES = 5-0 =5
Option -B
Q-D)
Earliest Start Time of Activity J is 39hrs.
Option-A