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# Arsey's S1 Edexcel Summer 2013 Model Solutions BOTH PAPERS Watch

1. (Original post by Spinny)
Hi Arsey, Isn't the median found by doing 1/2 X N which is 35 and you take the 35.5th value? That would make your interpolation different because you used 35 and not 35.5. Cheers
For the international paper that is
2. From what I know, we use 35.5th when the date is not grouped. eg, {1, 2, 3, 4...}
When it comes to grouped data (1<X<3;3<X<5...), we use the value straight from the calculated value, 70/2 = 35th
3. (Original post by Spinny)
For the international paper that is
Would you lose marks for doing it this way? Cheers
4. what if the venn diagram is drawn using decimal propabilities
5. (Original post by Ayesha Rathod)
what if the venn diagram is drawn using decimal propabilities
Some previous mark schemes have allowed answers as "x/100" or equivalent where "100" is the total number of the subject, ie written in probability form.

I would doubt whether or not you would gain all accuracy marks, although you should get the method marks providing the the probabilities have been converted correctly.
6. (Original post by zzachjoy)
Would you lose marks for doing it this way? Cheers
When you need to use interpolation, as you are dealing with grouped data, you must NOT round in any way.

Therefore you probably lost at least the accuracy marks.
7. (Original post by Kenny Loftun)
Arsey, for C2 do we need to know change of base (logs)? In your June 2011 C2 thread you say it's not needed as they don't ask questions regarding change of base?
Change of base may be used, although not always necessary to manipulate certain logarithms. In previous papers you may use change of base rule, although I don't remember any C2 paper directly asking to use it.

Even should they ask, you are provided with the formula.
8. (Original post by Graham981)
Change of base may be used, although not always necessary to manipulate certain logarithms. In previous papers you may use change of base rule, although I don't remember any C2 paper directly asking to use it.

Even should they ask, you are provided with the formula.
am i correct in thinking that the change of base rule is the only formula provided ? also what other formula's do we need to know regarding those ' show that ' questions that come up at the start of a diffrentiation one - especially formulae regarding circles/sphere's/cylinders

oh and regarding S1 , do you think i would lose a mark for not putting a zero in the rest of the sample space in the Venn Diagram question ? thanks
9. Is it okay if I drew the venn diagram in pencil.?

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10. Where is the unofficial mark scheme for last Fridays s1 exam please ??
11. I feel crap cos this exam was hard for me, ngl :')
12. im so confident with this paper after looking at arsey's answers, provided arsey's answers were right.
13. Does anybody have a list of all the past S1 grade boundaries?
Somebody posted it up for M1, but I cant seem to find it for S1
Thanks
14. (Original post by Undisclosed 15)
Is it okay if I drew the venn diagram in pencil.?

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I did my whole C1 exam in pencil and got 97 UMS
15. Did you use HB pencil?

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16. (Original post by Qmakz)
I did my whole C1 exam in pencil and got 97 UMS
Did you use HB pencil?

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17. (Original post by miah-117)
Where is the unofficial mark scheme for last Fridays s1 exam please ??
on page one of this thread........................
18. (Original post by Undisclosed 15)
Did you use HB pencil?

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It was a refillable one 1.4 HB I think
19. (Original post by Caribbeantwist)
Yeah you can't get any sort of special considerations unless there has been like a death or some kind of upset on that particular day, even then they are pretty harsh and only up your mark by a few percent!
I was really distracted, someone smelt like they hadn't washed for weeks, the guy next to me was doing some kind of leg exercises and everyone kept shuffling their papers really noisily! It's really irritating how some people don't have any consideration for other candidates! Oh well, join the s1 resit club I suppose!

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yeah , i wouldn't like that kinda thing done to me u know. but anyways i went and forced em to put me in a room this time for my physics retake, aced it , so deffo works, i would say make sure if you have requested separate room cos of extra time or even because u are easily distracted (like myself) make sure there is no way dat shiz a few of us taking the exam had.
20. What do we reckon, less than 75 for 100UMS?

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