During the early morning hours, customers arrive at a branch post office at an a
ID: 445805 • Letter: D
Question
During the early morning hours, customers arrive at a branch post office at an average rate of 45 per hour (Poisson), while clerks can handle transactions in an average time (exponential) of 4 minutes each.
For 5 clerks, what is the service rate (mu)?
For this network, what is the critical path?
Activity
Optimistic
Realistic
Pessimistic
1-2
2
3
5
1-3
7
8
9
2-4
2
2
2
2-5
3
6
8
1-4
3
4
4
3-4
2
2
4
3-6
4
5
6
6-7
3
7
12
4-7
7
9
14
5-7
5
6
8
Using probabilistic time estimates, how long will the project take? Do not round
Activity
Optimistic
Realistic
Pessimistic
1-2
2
3
5
1-3
7
8
9
2-4
2
2
2
2-5
3
6
8
1-4
3
4
4
3-4
2
2
4
3-6
4
5
6
6-7
3
7
12
4-7
7
9
14
5-7
5
6
8
Using Crystal Ball, what is the probability the project will be completed in 20 days or less? (express in %)
Activity
Optimistic
Realistic
Pessimistic
1-2
2
3
5
1-3
7
8
9
2-4
2
2
2
2-5
3
6
8
1-4
3
4
4
3-4
2
2
4
3-6
4
5
6
6-7
3
7
12
4-7
7
9
14
5-7
5
6
8
Explanation / Answer
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