Arsey's D1 Edexcel Summer 2013 Model Solutions BOTH PAPERS

Hey Arsey, sorry to annoy the crap out of you on both threads >.< but I was just wondering would I get penalised on Q1 for not drawing out my final matchings on the nodes they provided? I didn't see them on the next page and ended up drawing my own on the first.. Thanks as always.


Posted from TSR Mobile

Yes I don't. Do papers outside of UK differ from the one taken locally despite it also being from Edexcel; taken on the same day and time?

No, that is wrong. The LB is found from activities which must happen not may.

Second bit is fine.


Posted from TSR Mobile

Fairly reasonable paper I thought


1. Matchings - pretty simple, although not breaking down the 2 required paths into separate part of the question, could cause problems.


2. Quick sort and Bin packing - very easy, I thought it was odd how the first-fit decreasing didn't reduce the number of bins though


3. Prim's and Kruskal's - very easy


4. Dikky - harder than normal due to the sneaky part of the route. Quite easy to mank up b) too.


5. Postie - standard. A common error on c) will be to repeat DE.


6. LP - not easy but it never is. Part b) will be a bloodbath.


alt to part b)


no more than 1.5 times as many small as large


for every 3 small you need at least 2 big




7. CPA - Fairly standard but the backward scans not using the dummy paths will be a very common error. Gantt chart took too long. f) and g) will be poorly answered.



Overall I would say it was a little easier than Jan, I would expect it to be around 63 for an A.


This summer I will upload solutions to the following Edexcel papers:

Core 1;
Core 2;
Core 3;
Core 4;
FP1;
M1;
M2;
S1;
D1;
D2.

I will try to get hold of some solutions for FP2; FP3 and M3.

I don't do S2

All papers will be uploaded in line with site rules (please don't PM me asking when I will I be uploading them).

Fine


Posted from TSR Mobile

Fine


Posted from TSR Mobile

No, that is wrong. The LB is found from activities which must happen not may.

Second bit is fine.


Posted from TSR Mobile

thank you arsey and for the quick sort I got the same as you but it was messy but the examiners are they experienced markers , they wont deduct mark for it right?

and for question 1 the improved matching what did u have to show

Should be fine. Not all markers are experienced but if they are unsure they can ask their team leader who will be.

You can request a copy of your paper. It only costs about £10. Worth it if you think it has been marked incorrectly.

Regarding the improved matching, you can either list the matchings or draw them.


Posted from TSR Mobile

Fine


Posted from TSR Mobile

No


Posted from TSR Mobile

Should be fine. Not all markers are experienced but if they are unsure they can ask their team leader who will be.

You can request a copy of your paper. It only costs about £10. Worth it if you think it has been marked incorrectly.

Regarding the improved matching, you can either list the matchings or draw them.


Posted from TSR Mobile

Arsey thanks for putting up the mrkscheme

2 questions
1) in the bin packing do we have to state how much was wasted?
2) for prism algorithm do they mark the distance matrix table ?

Posted from TSR Mobile

I drew my gantt chart in pencil and i didn't get enough time to go over it in pen...is it alright? Will i lose marks because of this?😖


Posted from TSR Mobile

Yes I stated the complete matching like A=3,B=5 e.t.c for the 2 ? I did not draw them

That's fine


Posted from TSR Mobile

Fairly reasonable paper I thought


1. Matchings - pretty simple, although not breaking down the 2 required paths into separate part of the question, could cause problems.


2. Quick sort and Bin packing - very easy, I thought it was odd how the first-fit decreasing didn't reduce the number of bins though


3. Prim's and Kruskal's - very easy


4. Dikky - harder than normal due to the sneaky part of the route. Quite easy to mank up b) too.


5. Postie - standard. A common error on c) will be to repeat DE.


6. LP - not easy but it never is. Part b) will be a bloodbath.


alt to part b)


no more than 1.5 times as many small as large


for every 3 small you need at least 2 big




7. CPA - Fairly standard but the backward scans not using the dummy paths will be a very common error. Gantt chart took too long. f) and g) will be poorly answered.



Overall I would say it was a little easier than Jan, I would expect it to be around 63 for an A.


This summer I will upload solutions to the following Edexcel papers:

Core 1;
Core 2;
Core 3;
Core 4;
FP1;
M1;
M2;
S1;
D1;
D2.

I will try to get hold of some solutions for FP2; FP3 and M3.

I don't do S2

All papers will be uploaded in line with site rules (please don't PM me asking when I will I be uploading them).