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D1 Ocr Mei June 2012 Official Discussion Tweet

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1. D1 Ocr Mei June 2012 Official Discussion
Hi guys, I will do an unofficial mark scheme from what I can remember:
1.) draw network, then it was length 8 and a,c,e,g or something can't remember exactly but it had 4 arcs.

2.) relatively straightforward.
- application something to do with differentiation
-root 5 why is it included... not sure.

3.) For this graph theory question I can't remember exactly what I had but for part 2, i had one circle with a circle in it. and i had a little circle just touching the big circle.

4.)X = number of motors of type X made
etc
inequalities: there was one with x>5 and y>5 (greater than or equal to)

and 2 more i cant remember...

the max profit was where the two lines intersected.
for the last part the inequality changed and u just had to plot and give integer values.

5.) probably the hardest question, but bcoz it said 9 bags... u had to reject 9, and assign 0-7 to doubles and 8 to single.

You have to make your own simulations for day 4.
and i got 0.6 as final probability for last question.. i added all my probs up i had 4 (4/6) and one 2/6, then divide by 5.

6.) 14 minutes was min time, after you draw the network.. and critical activities i can't remember
1 dummy used for the initial drawing of the network
took 2 ppl to do it in min time
min time for one just add them all up 5.5 i think( excluding the 10 one h) or 15.5 if u add h on, question didn't really make it that clear.
and then u had to draw a critical network showing the 5.5 then the 10 then he 5.5 again and 10 three times...

CANT REMEMBER MUCH ELSE
Last edited by sreddy17; 01-06-2012 at 16:55.
2. Re: D1 Ocr Mei June 2012 Official Discussion
Q4) did you get 1750 or 1500 from the maximum profit
3. Re: D1 Ocr Mei June 2012 Official Discussion
(Original post by Aaqil)
Q4) did you get 1750 or 1500 from the maximum profit
4. Re: D1 Ocr Mei June 2012 Official Discussion
(Original post by Aaqil)
Q4) did you get 1750 or 1500 from the maximum profit
I got 1450 vs 1500, 1500 was what I put down.
For the last 2 parts of the last CPA question I got 46.5 and 26.5, I believe.
Overall the exam wasn't that bad, just the algorithm application in real life (what was that about??!) I didn't manage to answer.
5. Re: D1 Ocr Mei June 2012 Official Discussion
(Original post by Naum)
I got 1450 vs 1500, 1500 was what I put down.
For the last 2 parts of the last CPA question I got 46.5 and 26.5, I believe.
Overall the exam wasn't that bad, just the algorithm application in real life (what was that about??!) I didn't manage to answer.
ye i got 46.5 and 26.5 yes.. did u get 0.6 for probability thing on simulations
6. Re: D1 Ocr Mei June 2012 Official Discussion
When i drew the second activity on arc network i got a value of 35.5 minutes to complete the baking of three buns.... :/
But yes I got 26.5 for the last part.
7. Re: D1 Ocr Mei June 2012 Official Discussion
(Original post by Laura5494)
When i drew the second activity on arc network i got a value of 35.5 minutes to complete the baking of three buns.... :/
But yes I got 26.5 for the last part.
did you get my answers for the rest?
8. Re: D1 Ocr Mei June 2012 Official Discussion
Were there any dummies in Q6??
9. Re: D1 Ocr Mei June 2012 Official Discussion
(Original post by sreddy17)
did you get my answers for the rest?
I got £1500 for the maximum profit in the first bit, but when the constraint changed to 10x+12y<180, I got the maximum profit as £1450, with x=11 and y=5
10. Re: D1 Ocr Mei June 2012 Official Discussion
I meant to bring this paper home so I could upload to here for people to see, but they gave me an S2 paper when I asked at the end -.-
11. Re: D1 Ocr Mei June 2012 Official Discussion
(Original post by Laura5494)
I got £1500 for the maximum profit in the first bit, but when the constraint changed to 10x+12y<180, I got the maximum profit as £1450, with x=11 and y=5
ye ok did u get 0.6 for simulations or what
12. Re: D1 Ocr Mei June 2012 Official Discussion
(Original post by Sufian_TRP)
Were there any dummies in Q6??
1 dummy
13. Re: D1 Ocr Mei June 2012 Official Discussion
No i didn't. I didn't know how to start with the first rule. I wasn't sure whether to use 8/9 and 1/9 or 4/5 and 1/5 because the bags were connected together... :/
So i ended up getting an overall probability of a half which I am pretty sure is wrong
14. Re: D1 Ocr Mei June 2012 Official Discussion
(Original post by Bennyboy260692)
I meant to bring this paper home so I could upload to here for people to see, but they gave me an S2 paper when I asked at the end -.-
what did u get for simulations question
15. Re: D1 Ocr Mei June 2012 Official Discussion
I got 3 dummies...
16. Re: D1 Ocr Mei June 2012 Official Discussion
(Original post by Laura5494)
No i didn't. I didn't know how to start with the first rule. I wasn't sure whether to use 8/9 and 1/9 or 4/5 and 1/5 because the bags were connected together... :/
So i ended up getting an overall probability of a half which I am pretty sure is wrong
u have to reject 9 because there are 9 bags and u have 10 numbers!! do u get me?
17. Re: D1 Ocr Mei June 2012 Official Discussion
(Original post by It's Jo :))
I got 3 dummies...
pretty sure its just the 1
18. Re: D1 Ocr Mei June 2012 Official Discussion
(Original post by Laura5494)
No i didn't. I didn't know how to start with the first rule. I wasn't sure whether to use 8/9 and 1/9 or 4/5 and 1/5 because the bags were connected together... :/
So i ended up getting an overall probability of a half which I am pretty sure is wrong
and the question said each of the 9 bags has an equal probability
19. Re: D1 Ocr Mei June 2012 Official Discussion
Yes but 8 of the bags were connected. Thats what confused me. So overall there were 5 sets of bags.
Ahh i flopped it :/
20. Re: D1 Ocr Mei June 2012 Official Discussion
(Original post by Laura5494)
Yes but 8 of the bags were connected. Thats what confused me. So overall there were 5 sets of bags.
Ahh i flopped it :/
on day 2 there were 9 bags right? if each has an equal probability then u must assign 0-7 to double and 8 to single bags. and reject 9 do u get that?

oh dont worry it will be fine