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# AQA D2 Unofficial mark scheme

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1.

a. 58 hours
b. CGIKL
C. Float time = 2 (1)
d. Answers seen: 60 - 63 for this, unsure (3)

2. 61 (9)

3. Define zero-sum game (1)

Monica plays C Vladimir plays D (2)

B dominated by C

play A with p = 0.6, C with 0.4 (8)

Play D with 0.9, E 0.1 F 0 (4)

4. 3 as 8 < 20 and 15

Max P = 36, x = 6, y = 0, z = 6, s = 8?, t = 0, u = 0

5

DBCA (10)

£28100 (1)

6.

X = 45? (2)

Max flow = 32

Hope these are all right.
2. (Original post by Bobjim12)

1.

a. 58 hours
b. CGIKL
C. Float time = 2
d. 60 hours worker 1: critical path 2: everything else

2. 61

3. Define zero-sum game

Monica plays C Vladimir plays ?

B dominates C

play A with p = 0.6, C with 0.4

Play D with 0.9, E 0.1 F 0

4. 3 as 8 < 20 and 15

Max P = 36, x = 6, y = 0, z = 6, s = 8?, t = 0, u = 0

5

DBCA

£28100

6.

X = 45?

Max flow = 32

Hope these are all right.
I agree with all of them apart from 60, I got 61
3. (Original post by Jm098)
I agree with all of them apart from 60, I got 61
4. That was a lovely D2 exam overall I think, and a nice end to the exam season

Most of your answers I can remember getting, so pretty confident overall - probably dropped 3 marks though.
5. (Original post by Bobjim12)
I delayed to fit B? then H and I, but as F has float time of 2 so I only needed to be delayed by 3 days
6. (Original post by Dapperblook22)
That was a lovely D2 exam overall I think, and a nice end to the exam season

Most of your answers I can remember getting, so pretty confident overall - probably dropped 3 marks though.
It was quite a nice paper, i felt though that i was gonna run out of time as i just finished 4 with about 25 minutes to go. Thank God that i didn't make any mistakes while rushing the last question. The extra flow table scared me a little bit; there were like 8 blocks but i could only find 3 flows!
7. (Original post by Jm098)
I delayed to fit B? then H and I, but as F has float time of 2 so I only needed to be delayed by 3 days
I saw that E and B needed to be moved. After moving these, B was over the end of J by two hours, hence 60, but i feel as though you might be right with using F's float time
8. I got the exact same answers, for every question, I'm so happy
9. (Original post by Bobjim12)
It was quite a nice paper, i felt though that i was gonna run out of time as i just finished 4 with about 25 minutes to go. Thank God that i didn't make any mistakes while rushing the last question. The extra flow table scared me a little bit; there were like 8 blocks but i could only find 3 flows!
Yeah, there were too many blocks , I got four flows of 1 though, so a total augment of 4 overall (there was also two flows of 1 and one of 2 as an alternative) to give a max flow of 32.
10. (Original post by Dapperblook22)
Yeah, there were too many blocks , I got four flows of 1 though, so a total augment of 4 overall (there was also two flows of 1 and one of 2 as an alternative) to give a max flow of 32.
Oh yes, i had 1 2 and 1 flows. Excellent. I may have just scraped 100 in this one! Quite convenient after the shambles that was M3
11. What has it been for full UMS? Like 73?
12. Could you do the network flows in pencil as well? Haha
13. (Original post by Jm098)
What has it been for full UMS? Like 73?
Its been like 73/74 most years
14. For the simplex question, did people get fractions as their final values for P etc? I did and just wrote them to 3 dp.... Is this right?
15. (Original post by Jm098)
Could you do the network flows in pencil as well? Haha
Yes and no (kinda); in reports they recommended doing the initial flow in pen so it is clearer to the examiner to see and then augmenting the flows with pencil.
16. (Original post by Dapperblook22)
Yes and no (kinda); in reports they recommended doing the initial flow in pen so it is clearer to the examiner to see and then augmenting the flows with pencil.
Oh really did it all in pencil
17. Not sure 1d is correct because of you assign one worker critical path and the other everything else you end up starting I before you've finished its presendence(E) and so it doesn't work
18. was it monica C and vladmir D for their play-safe strategies?

also, did we have to state the minimum completion time?! I didn't - i just left it in the diagram
19. how many marks was dynamic programming? was it 9 for the table + 1 for the max profit,
or 10 for the table and 1 for the max profit?
20. (Original post by Bobjim12)

1.

a. 58 hours
b. CGIKL
C. Float time = 2
d. 60 hours worker 1: critical path 2: everything else

2. 61

3. Define zero-sum game

Monica plays C Vladimir plays ?

B dominates C

play A with p = 0.6, C with 0.4

Play D with 0.9, E 0.1 F 0

4. 3 as 8 < 20 and 15

Max P = 36, x = 6, y = 0, z = 6, s = 8?, t = 0, u = 0

5

DBCA

£28100

6.

X = 45?

Max flow = 32

Hope these are all right.
Can you add the marks to each question if you can remember, thanks

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