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CCEA S1 Mathematics - 30th May 2014

Poll

How difficult did you find the exam?

Hi everyone. Please feel free to post any thoughts/queries/notes/worries before and after the exam.

If you feel like it, you can post your solutions so we can all compare answers

I have attached my unofficial mark scheme.
(edited 9 years ago)
CCEA S1 May 2014 Unofficial Mark Scheme.pdf401.3KB

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Reply 1
Avatar for Mr Tall
Mr Tall
9
**** paper, read the last question wrong **** MY LIFE
Reply 2
Avatar for Mr Tall
Mr Tall
9
i didnt read the last question where it said "red is replaced and an additional one added" I did the whole question but didn't take into account that red was added and replaced.....

will I get zero for part i) ii) ans iii) in that case? I drew a tree diagram (correct) i think, for both colours not being replaced and got 1/5 as the probablilty that a white is picked
Do you want me to post the paper up? I have it here
Reply 4
Avatar for Mr Tall
Mr Tall
9
Original post by stephen_mcgarry
Do you want me to post the paper up? I have it here

yes mate! itd be great if someone could d a markscheme too :P
Reply 5
Avatar for Mr Tall
Mr Tall
9
what did you get for the mean and standard deviation for normal dist question?
Original post by Mr Tall
what did you get for the mean and standard deviation for normal dist question?


Mean = 48.1
Standard deviation = 14.1

Posted from TSR Mobile
OK guys here's the full paper


Posted from TSR Mobile
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Original post by Mr Tall
i didnt read the last question where it said "red is replaced and an additional one added" I did the whole question but didn't take into account that red was added and replaced.....

will I get zero for part i) ii) ans iii) in that case? I drew a tree diagram (correct) i think, for both colours not being replaced and got 1/5 as the probablilty that a white is picked


Slightly annoyed about the last one as well, didn't get the last part as I ran out of time :frown: I think part ii) was too long, a lot to work out

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Reply 9
Avatar for TheBigBoy
TheBigBoy
1) (i) a=14
(ii) standard deviation= 5.099

2) (i) 0.434
(ii) 0.812
(iii) 0.0355

3) (i) lamda=3
(ii) 0.577

4)(i) k=3
(ii) Var(X)= 0.0375
(iii) 0.512

5) (i) 6/7
(ii) a b and c all No

6)(i) distribution table
(ii) 5
(iii) 2.5

7) mean=48.1 s.d=14.2

8)(i) 0.3
(ii) 0.929
(iii) 5/19
OK here is all of my answers, I need to redo Q8, but I'll add it shortly

1)i) a=14
ii) sqrt26 = 5.10 (3sf)

2)i)a) 0.434
i)b) 0.812
ii) 0.0356

3)i) Guessed - E(X) = variance
Hence E(X) = (standard deviation)^2
ii) 0.577

4)i) k=3
ii) 0.0371
iii) 0.512

5)i) P(AUB) = 6/7
ii)a) A and B not mutually exclusive as P(AnB) is not equal to 0
ii)b) A and B are exhaustive and P(A) + P(B) = 1 (friends answer)
Or, A and B are not exhaustive as P(PUB) is not equal to 1 (my answer)
Unsure which is correct
ii)c) A and B not independent as P(AnB) is not equal to P(A) x P(B)

6)i) x | 2 | 3 | 4 | 5 | 6 | 7 | 8
P(X=x) | 1/16 | 1/8 | 3/16 | 1/4 | 3/16 | 1/8 | 1/16
Done respectively
ii) E(X)=5
Table is symmetrical, and the centre value of x is 5
iii) Var(X) = 2.5

7) Mean = 48.1
Standard deviation = 14.1

8)i) 3/10 = 0.3
ii) 13/14 = 0.929
iii) 5/19 = 0.263

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(edited 9 years ago)
Original post by TheBigBoy
1) (i) a=14
(ii) standard deviation= 5.099

2) (i) 0.434
(ii) 0.812
(iii) 0.0355

3) (i) lamda=3
(ii) 0.577

4)(i) k=3
(ii) Var(X)= 0.0375
(iii) 0.512

5) (i) 6/7
(ii) a b and c all No

6)(i) distribution table
(ii) 5
(iii) 2.5

7) mean=48.1 s.d=14.2

8)(i) 0.3
(ii) 0.929
(iii) 5/19


For 5)ii) I put all no, but friends said that Exhaustive is yes as P(A) + P(B) = 1
Is this correct?

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Original post by stephen_mcgarry
For 5)ii) I put all no, but friends said that Exhaustive is yes as P(A) + P(B) = 1
Is this correct?

Posted from TSR Mobile


I have no idea. Guessed them all very quickly cos they were only worth a mark each
Original post by TheBigBoy
I have no idea. Guessed them all very quickly cos they were only worth a mark each


Oh that's OK, you don't know what exhaustive means do you? I thought it was P(AUB) = 1

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Original post by stephen_mcgarry
Oh that's OK, you don't know what exhaustive means do you? I thought it was P(AUB) = 1

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Think i got about 68-70 in this paper which should hopefully make up for how horrendously horrific i did in C3
Original post by TheBigBoy
Think i got about 68-70 in this paper which should hopefully make up for how horrendously horrific i did in C3


Yeah I hope to have around that as well! I thought C3 went well :s-smilie: hopefully
What did you make of C4?

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Original post by stephen_mcgarry
Yeah I hope to have around that as well! I thought C3 went well :s-smilie: hopefully
What did you make of C4?

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Easier than C3 but still hard. Hoping to have got mid Bs in those two and now a very high A in S1 which should hopefully even out at a high B/ low A
mark scheme anyone?
Original post by TheBigBoy
Easier than C3 but still hard. Hoping to have got mid Bs in those two and now a very high A in S1 which should hopefully even out at a high B/ low A


I think they both went relatively well, I went in hoping to attain my B overall, I feel like they went well enough to average 90% between them, so really hoping for an A* ooh such a wait till August though

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can someone please put up a mark scheme :smile:

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