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Edexcel D1 - 17th June, 2016 [Exam discussion] watch

1. (Original post by Ilkonebi)
I got the same. Lots of people got 5 though, so i*m not sure if I did the late/early times right on that question.
I think if you calculated the lower bound it would be 4, but using the Gantt chart it would be 5
2. (Original post by mustumar)
For the objective function I wrote C=10x+15y without simplifying further, would that affect the number of marks I'd achieve

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It did say to write 'an objective function', it didn't ask about simplest form or anything. It's correct so you should get full marks (if the rest of the question is correct). If they were strict about that then you would only lose 1 anyway but I doubt it
3. Hey all - so after going over my markscheme and what answers everyone got, I think ive got just below 50 marks - 48ish. Quite disheartened atm, feel really bad - I think C1 ive got 71/75 and C2 around 60/75 so I wanted a solid test to secure the A. I also do further maths and did bad on Fp1 50/75, started panicking because I ran out of time and did not even realise - Im really strong at Fp1 too which sucks, but M1 I think I have got around 64/75 so pulled it up a bit. I have got D2 left to learn - if I can really do well in that, is there still a chance of an A? Because then 4 of my modules will have 60 marks plus and two of them will be around 50? Then surely if I resit FP1 next year it will all be good.
4. share the mark scheme guys
5. is there an unofficial mark scheme yet?
6. (Original post by xturqz)
It did say to write 'an objective function', it didn't ask about simplest form or anything. It's correct so you should get full marks (if the rest of the question is correct). If they were strict about that then you would only lose 1 anyway but I doubt it
Hold on, wasn't the objective function to maximise capacity/containers or something-not cost.
7. (Original post by TrueDAN)
Hey all - so after going over my markscheme and what answers everyone got, I think ive got just below 50 marks - 48ish. Quite disheartened atm, feel really bad - I think C1 ive got 71/75 and C2 around 60/75 so I wanted a solid test to secure the A. I also do further maths and did bad on Fp1 50/75, started panicking because I ran out of time and did not even realise - Im really strong at Fp1 too which sucks, but M1 I think I have got around 64/75 so pulled it up a bit. I have got D2 left to learn - if I can really do well in that, is there still a chance of an A? Because then 4 of my modules will have 60 marks plus and two of them will be around 50? Then surely if I resit FP1 next year it will all be good.
It's not worth thinking about past exams to be honest. I'm in A2 now, and, like you, I tried to predict my grade last year. Turns out I was way off. I predicted As in most of my modules and, instead, got Bs in most of them. Forget that these exams have ever happened

Don't worry about it until results day.

Put all of your efforts into D2. I reckon dynamic programming will be difficult this year considering last years was a godsend.
8. (Original post by oinkk)
It's not worth thinking about past exams to be honest. I'm in A2 now, and, like you, I tried to predict my grade last year. Turns out I was way off. I predicted As in most of my modules and, instead, got Bs in most of them. Forget that these exams have ever happened

Don't worry about it until results day.

Put all of your efforts into D2. I reckon dynamic programming will be difficult this year considering last years was a godsend.
Thank you - guess I should just stop worrying and leave it in the past!
Will do lots of practise on dynamic programming!
9. unofficial mark scheme anyone please?
10. (Original post by iMacJack)
For the algorithm question which of 122 and 0.5 should be X, I said 122 because it is an integer value, would this gain any of the marks? Student403 NotNotBatman
It's really hard to tell with D1, but that should get you the mark as x had to be an integer to get a value of 0.
11. (Original post by NotNotBatman)
It's really hard to tell with D1, but that should get you the mark as x had to be an integer to get a value of 0.
Awesome. Cheers

What was your opinion on the paper?
12. (Original post by iMacJack)
Awesome. Cheers

What was your opinion on the paper?
Standard paper, but somehow I forgot things during the exam. I couldn't even draw the activity network, so I did an extremely messy one with about 4 overlaps. There were no questions that were very different from questions in previous papers, so I'm guessing 61 for an A. I haven't checked answers with anyone else yet, so I don't know how many I got wrong, but I will have the question paper next week, so I can check.
13. (Original post by NotNotBatman)
Standard paper, but somehow I forgot things during the exam. I couldn't even draw the activity network, so I did an extremely messy one with about 4 overlaps. There were no questions that were very different from questions in previous papers, so I'm guessing 61 for an A. I haven't checked answers with anyone else yet, so I don't know how many I got wrong, but I will have the question paper next week, so I can check.
I'd argue the questions were fairly standard but it was just a really time consuming paper, 61 for an A seems too low no?
14. (Original post by NotNotBatman)
Standard paper, but somehow I forgot things during the exam. I couldn't even draw the activity network, so I did an extremely messy one with about 4 overlaps. There were no questions that were very different from questions in previous papers, so I'm guessing 61 for an A. I haven't checked answers with anyone else yet, so I don't know how many I got wrong, but I will have the question paper next week, so I can check.
I managed to get that activity network but I had to do two curved lines to get the final arcs to the final node. Oh well...

Also, for the one about why starting at an odd node I put:

Starting at an odd node means that there will only need to be one repeated pair of nodes, therefore the overall weight will be reduced by starting at an odd node

Or something very similar - is this acceptable?
15. (Original post by Yua)
I'd argue the questions were fairly standard but it was just a really time consuming paper, 61 for an A seems too low no?
You're joking, right? Last years was 59 and that was a joke of a paper lol
16. (Original post by Yua)
I'd argue the questions were fairly standard but it was just a really time consuming paper, 61 for an A seems too low no?
I'm thinking some people would have struggled with the linear programming, making the boundaries a bit lower than usual. In recent years the boundaries have been a bit lower too.

(Original post by iMacJack)
I managed to get that activity network but I had to do two curved lines to get the final arcs to the final node. Oh well...

Also, for the one about why starting at an odd node I put:

Starting at an odd node means that there will only need to be one repeated pair of nodes, therefore the overall weight will be reduced by starting at an odd node

Or something very similar - is this acceptable?
You need to explain that the graph is semi-traversable, so you'd probably lose a mark there.
17. (Original post by NotNotBatman)
I'm thinking some people would have struggled with the linear programming, making the boundaries a bit lower than usual. In recent years the boundaries have been a bit lower too.

You need to explain that the graph is semi-traversable, so you'd probably lose a mark there.
62/75 then. What a **** up I made of this exam
18. (Original post by NotNotBatman)
I'm thinking some people would have struggled with the linear programming, making the boundaries a bit lower than usual. In recent years the boundaries have been a bit lower too.

You need to explain that the graph is semi-traversable, so you'd probably lose a mark there.
what if you write, it makes the graph semi eulerian which means you can start at one odd node and end at another odd node.
19. (Original post by gekkelekkebekke)
For the very last question I found V as an exact value, then did point testing with integer solutions around it, subbing them back into the inequalities to see if they satisfy. In the end I got 11,4 or something. Then the last part asked for the COST. This really tripped me up and I was about to cross everything out but I then decided to sub 11 and 4 into the cost inequality that you found out in part a) or something, did anyone else get the same?

Also, for the 24y - x => 24 did anyone else get the line going through 0,1, and 24,2? that was the only way to get it on with a gradient of 1/24, please let me know if you put the same.
20. (Original post by NoahMal)
For question 7 the scheduling with an extra 6 leniency, did anyone else manage to do it using 3 workers?
Same, but I got 4 extra, not 6...

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