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

1. ****ed up calculating float (thought it was 0) for one activity. Assuming everything else was right, how many marks would I lose?

I don't think I'll lose any for the 3rd and 4th parts to that question as the activity fit on the end of the first worker anyway.
2. (Original post by _newbe)
but if it was the optimal point at 10.8 or whatever it would have to be lower as that is the maximum just wondering
It went up on a scale of 2 per box or something. So 11 was 2.5 of the tiny boxes along the x axis, which still fit within the constraints by simple observation
3. (Original post by iMacJack)
entire linear programming question was 14 marks

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(Original post by Nikhilm)
14 marks in total and thanks
***** ******** ********** ********
4. (Original post by Student403)
Do remember there were other constraints aside from the cost one
I'm an idiot ahah, what was I thinking in the exam! Thanks :P

Hopefully I can still scrape above the 80 UMS boundary ;/
5. Can anyone remember the 3 different lengths of the possible routes in the route inspection problem
6. (Original post by Student403)
Do remember there were other constraints aside from the cost one
one of them was x greater than or equal to 8

another was, -X +24y greater than equal to 24

cant remember the others.
7. If anyone has an unofficial markscheme with the amount of marks for each part in each question ... if you could link it that would be very much appreciated.
8. (Original post by Student403)
Do remember there were other constraints aside from the cost one
-x+24y>= 24
x>=24
7x+8y<= 112?

objective line
maximise x + 1.5y

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9. What value did you guys get for t??
10. What were the values for w, x, y, z
I think w was 11, z was 4 and yx were the numbers in the adjacent boxes.
11. Im a million percent sure
Prim= 80
Optimal Vertex = 11,4
Total Cost = £480
12. (Original post by _newbe)
simple observation alright don't need to keep underlining your right really you don't know you are just guessing I did the question in 5 minutes so didn't have time to count squares in the graph just went off the principles of linear programming I've spoke to a lot of people you put 10 so it's up in the air
Oh I'm guessing? ... If you say so.

Constraints are below. Feel free to try them both out and let me know if 11, 4 fits

(Original post by iMacJack)
-x+24y>= 24
x >=2
7x+8y<= 112?
20x + 65y <= 520

objective line
maximise x + 1.5y

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Oh I wasn't asking but cool that you remembered it was x>= 2 btw, IIRC
Just inserted the other one for sake of guy above
13. What was the lower bound number of workers for the gantt chart question??
14. (Original post by Harrydickens)
Can anyone remember the 3 different lengths of the possible routes in the route inspection problem
75 was the shortest( not sure thou)
15. What were all th questions in linear programming q?
16. (Original post by Nuggetsarelife)
Im a million percent sure
Prim= 80
Optimal Vertex = 11,4
Total Cost = £480
Any chance you can remember any of the arcs you listed or weights that added up to 80? Long shot i know :/
17. [QUOTE=lotterydiscovery;65877804]Any chance you can remember any of the arcs you listed or weights that added up to 80? Long shot i know :/[/QUOTE

NO WAY!😂
18. (Original post by Student403)
Oh I'm guessing? ... If you say so.

Constraints are below. Feel free to try them both out and let me know if 11, 4 fits

Oh I wasn't asking but cool that you remembered it was x>= 2 btw, IIRC
Just inserted the other one for sake of guy above
I'm guessing aswel cos I don't know the markscheme your going on like you wrote the paper nothing worse than when people go on like cocky idiots on the student room to put others down about an exam I was simply only asking regardless it is like a mark on the paper
19. (Original post by Vannzzoo)
What value did you guys get for t??
135 and then 61
20. (Original post by Katiee224)
I did the gantt chart in pencil, will they still mark it?
diagrams can be done in pencil. as long as its like a standard hb one should be fine

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