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# GCE ‘A’ Level 2010 Oct/Nov H2 Maths 9740 Paper 2 Suggested Answers & Solutions

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Tuition given in the topic of H1/H2 (A Level) Maths Tutor from the desk of at 4:30 am (Singapore time)

Updated on

Sorry to have kept everyone waiting, especially those who have been camping at the H2 Maths Paper 1 blog post.

Before that blog post’s comments section turns into a mini chit-chat lounge, here are the H2 Maths Paper 2 solutions that I’ve managed to get them done up despite my busy day (yesterday), with a little help from my siblings once again.

2010 ‘A’ Level October/November H2 Mathematics 9740 Paper 2 Suggested Solutions

Like students under exam pressure, I’ve done this under a bit of ‘pressure’ as well from the baying horde of “When will paper 2 be out?!”, “answers please!!!” etc. So, as with Paper 1, please leave a comment whenever you spot any mistake, typo and/or better/quicker/smarter methods (I really appreciate these! :)) and I’ll update the solutions as and when required.

Meanwhile, good luck for your remaining papers, and good morning to you if you’re seeing this the first thing on a bright Saturday morning!

As for me, it’s time for bed …

### Revision Exercise

To show that you have understood what Miss Loi just taught you from the centre, you must:

1. anonymous commented in tuition class

2010
Nov
13
Sat
5:09am

1

thanks for being efficient. could you estimate a threshold for getting an A for us?(:

2. ... commented in tuition class

2010
Nov
13
Sat
5:27am

2

just wondering if i calculate s^2 wrongly.. my p-value will be diff.. do we get heavily penalised??? as for e prob question got my 1st part wrong thus my subsequent parts.. do we get ecf on dat??

3. annonymous commented in tuition class

2010
Nov
13
Sat
7:14am

3

Q10i) says draw. do u use the graph paper?
Q10ii) says correct to 4d.p, i think u made a mistake.

4. :D commented in tuition class

2010
Nov
13
Sat
7:20am

4

q10ii) is wrong. the answer wants 4 dp (:

5. Clement commented in tuition class

2010
Nov
13
Sat
7:32am

5

Thanks for the answers! Btw the answers for 10 (ii)(a) and (b) should be in 4 d.p not 3 s.f.

6. anon commented in tuition class

2010
Nov
13
Sat
7:32am

6

hi! thanks for the answers 🙂 but for question 10 (ii) the question asks for the answers to be corrected to 4 decimal places, but your answers are in 3 dp. yup just letting you know! 🙂

7. Shermz commented in tuition class

2010
Nov
13
Sat
7:47am
8. K commented in tuition class

2010
Nov
13
Sat
7:53am

8

ya.. what will be the minimum to get A? i think i only have 72% of it, will i fall short for an A, badly?

9. orangejuice commented in tuition class

2010
Nov
13
Sat
8:11am

9

HEY! thank you SO MUCH for your efficiency!
feel so relieved after seeing the solutions!
anyway, for question 10, just want to point out a minor mistake in your solutions.
10(ii) they want us to leave the answer correct to 4 dp instead of 3.
I just realise it too 🙁

10. DD commented in tuition class

2010
Nov
13
Sat
8:15am

10

thank you so much for uploading the solutions so fast! for the inequality question of 7v), shouldn't the lowest probability be 0 because there is a chance B and C are mutually exclusive?

• 2010
Nov
16
Tue
12:50am

10.1

@DD: For Q7, if P(B) and P(C) are mutually exclusive, then they would not intersect as shown in the following Venn Diagram:

From part (ii), P(AB) = 0.92 and from part (iv), we have P(A' ∩ C) = 0.15, which is the shaded region in the diagram.

However, in the diagram above, P(ABC) = 0.92 + 0.15 = 1.07 which is 0.07 greater than the expected total probability of 1.

Hence there must be at least a minimum intersection between B & C such that P(A' ∩ BC) is at least 0.07 as shown in the black region of the following diagram:

11. natalie commented in tuition class

2010
Nov
13
Sat
8:17am
12. Otto commented in tuition class

2010
Nov
13
Sat
8:22am

12

It is difficult to obtain the exact number of spectators belonging to each stratum.

Izzit okay? Thanks. 🙂

13. Anon commented in tuition class

2010
Nov
13
Sat
8:40am

13

Thank you! 😀

I have 3 questions.

For 1ii), once we obtain the value of a and b, can we solve it using GC? Question did not specify that we couldn't >.<

For 4iii(, is it necessary to prove that fg(x) exists before going on to prove the ans?

For 11v), since the lowest possible number of busy days is 0 and will not be negative, should it be normalcdf(0,9.5 etc) instead of normalcdf(-e99 etc)? You get a slightly different answer: is that wrong?

Oh, for 10ii), it's to 4dp not 3sf. Thank you very much! (:

• 2010
Nov
15
Mon
8:28pm

13.1

@Anon: For Q1(ii), using your G.C. to obtain your final roots should by and large be fine. However, for a 5-mark question, I would recommend at least indicating in your workings that the conjugate of −2 + i (i.e. −2 − i) is also a root.

Regarding Q4(iii), I believe that for this 2-mark question, you should be fine as long as you've demonstrated clearly in your workings how you've successfully derived fg(x). So don't worry about the additional proving of the existence of fg(x) (which is left there for our own checking only :P)

As for Q11(v), this has been amended since version 1.2 of the solutions.

14. e commented in tuition class

2010
Nov
13
Sat
8:45am

14

just a small quibble but for the product moment correlation coefficient question, the paper asks for 4 d.p. instead of 3 s.f. heh 🙂 i almost made that mistake too...

15. Daniel commented in tuition class

2010
Nov
13
Sat
9:04am

15

Hi, my answer is almost the same as yours.
+) question 3i) I proved that dy/dx always greater than 0 and thus it has only 1 turning point, that is the minimum.
I wonder if the examiner will penalize me for this unnecessary working. Eventually i also get x= -4/3 like u.
+) Question 8ii) My answer is 0.067 🙁 My working is (2x2x1x2!) 5!
+) Question 10 iv) : Can i just say we cannot use both regression lines b/c we cannot use value of drag force to estimate the value of wind speeds.
The rest should be okay!!!
Thanks for ur solution !!!

• Daniel replied to Daniel’s comment

2010
Nov
13
Sat
9:05am

15.1

@Daniel: Ey ey wrong wrong,
Question 3i) I proved d2y/dx2 always greater than 0. NOt dy/dx

• 2010
Nov
15
Mon
8:55pm

15.2

@Daniel: For the 5 marks in Q3(i), I believe it should be OK if 1) you've differentiated correctly 2) expressed the answer as a single fraction 3) equated your differentiated expression to zero 4) shown that there's only one turning point and 5) finally obtained this value of x at the turning point.

Additional gey kiang workings should be fine unless you did them wrongly 😉

For Q10(iv), I believe it's more appropriate to enhance your statement by indicating the reason that v is the independent variable in your final answer.

16. greenapple commented in tuition class

2010
Nov
13
Sat
9:09am

16

hey! all's good! except that for qns 10 (ii), it's to 4 d.p., cnt correct it to 3 s.f. ~ anw, thanks for the neat and comprehensive solutions!

but there's sth troubling me really badly. i hope u can enlighten me though.

if for instance, i made an error in part (i) of a qns, and that caused me to have an incorrect ans for (i), which unfortunately is required in the subsequent parts. and of course, my other ans became terribly wrong as well.

i'd like to clarify, will i be awarded method marks? and if yes, is it going to be a pathetic mark, or are they like just going to minus 1 mark for my wrong ans, assuming that my method is sound?

17. J commented in tuition class

2010
Nov
13
Sat
9:15am

17

Sir!! For the hypo testing qn do we use Z-test or T-test since it is normally distributed?:)

PS thanks for working out the answers!

18. xy commented in tuition class

2010
Nov
13
Sat
9:18am

18

if i calculated 11(iii) wrongly, does it means that for (iv) and (v) no matter whether my approach is correct i will still be wrong? or i will be marked down?

19. James commented in tuition class

2010
Nov
13
Sat
9:20am

19

Hey for question 10 (ii), the answers should be to 4 dp as required. No need to round off to 3 sf 🙂

20. James commented in tuition class

2010
Nov
13
Sat
9:24am

20

Hi, for qn 4 (iii), I don't think it is necessary to show that Rg is a subset of Df. Isn't it just substitution and simplifying the fraction to get the two marks?

• 2010
Nov
15
Mon
9:06pm
21. Anonymous commented in tuition class

2010
Nov
13
Sat
9:37am

21

Hi thanks for uploading the answers so efficiently! =) But I'm not sure if for question 10 (ii) the answers should be 0.9860 and 0.9907 instead because the question asked for answers to be corrected to 4 decimal places.

22. Anon commented in tuition class

2010
Nov
13
Sat
9:43am

22

for the regression qn, it's 4dp, u read wrongly! the product moment part

23. RJ commented in tuition class

2010
Nov
13
Sat
9:51am
24. meyeyumi commented in tuition class

2010
Nov
13
Sat
10:00am

24

hmmmmm, i tink i spotted some error
10ii question say correct to 4dp not 3sf
and if i am not wrong the C.C. are wrong, should be the other way round.
thx a lot for this

25. meyeyumi commented in tuition class

2010
Nov
13
Sat
10:10am

25

sry my bad the C.C. are correct, i m wrong OMG!

• Audrey replied to meyeyumi’s comment

2010
Nov
14
Sun
12:19am

25.1

@meyeyumi: i think the C.C are wrong ;o i thought P(k<x<k) = P(k-0.5<x<k+0.5)??

• 2010
Nov
15
Mon
7:43pm

@Audrey: When using a CC to approximate a discrete distribution, you'll need to consider whether the number(s) at the limit(s) of the probability interval need(s) to be accommodated ⇒ you need to be mindful of the inequality/equal sign(s) i.e.

P(k < X < k) becomes P(k+0.5 < X < k−0.5) ∵ k is not included in the interval
P(kXk) becomes P(k−0.5 < X < k+0.5) ∵ k is included in the interval

Similarly,
P(X > k) becomes P(X > k+0.5)
P(Xk) becomes P(X > k−0.5)

So for the CC in Q11(iii), P(T > 2200) becomes P(T > 2200.5) ∵ 2200 is not included in the interval.

26. verlyncheng commented in tuition class

2010
Nov
13
Sat
10:11am

26

thanks mr loi(:
you may want to check q10(ii) answers. it's to 4dp, stipulated by qn.

anyway, i think if your answers are right, i'm getting my perfect score for the paper (:

thank you for making my day!
cheers!

27. Otto commented in tuition class

2010
Nov
13
Sat
10:20am

27

Erm, the r values for Q10ii are to be given in 4 d.p., not 3 s.f.

28. Kate commented in tuition class

2010
Nov
13
Sat
10:21am

28

Hi for qn 9 part i is it necessary to square thr variance (the 2 in front) because I thought it's just y-(x+x) so should be var(y-2x) = var(y) + var(x) + var(x)?
Or am I wrong?
I thought only price need to square for this qn...

• 2010
Nov
15
Mon
9:28pm

28.1

@Kate: For Q9(i) and (ii), it's important to understand whether multiples or sums are being considered.

In part (i), we're dealing with twice the number of minutes of peak calls which is a multiple so you'll have to square its variance i.e. Var(2X) = 22Var(X).

29. brian commented in tuition class

2010
Nov
13
Sat
10:24am

29

ppl relax. Math a level maximum A grade floor in the past few years is 73. It's not a perfect bell curve.

Plus since it's an easy paper, they prolly will be more picky abt working and stuff to differentiate.

30. Anonymous commented in tuition class

2010
Nov
13
Sat
10:31am

30

Sigh, after reading so many comments regarding the bell curve, i decided i would contribute my 10 cents worth. First thing to note is that the A levels is not to test your relative performance amongst other Singapore students. It is supposed to be an indicator/measure of your knowledge as an 18 year old and your preparedness to be able to continue higher education. From cambridge's perspective, the papers they set should be in line with those requirements. As what my GP tutor says, it would be unfair to use the bell curve if indeed the quality of this year's students are better than that of last years (meaning if many of you score 80 plus, so what? The A will still hover around 70) unless they feel that the paper quality has changed which will not be much comparing last years and this years and hence they might increase the requirement to say 75 for an A?). The approximate quote given by the cambridge markers were " If we require you to swim 100 metres to get the A and you have shown us that you are capable, you will get it regardless of whether a big group of students have proven themselves to be able to swim around the world"

31. anonymous commented in tuition class

2010
Nov
13
Sat
10:35am

31

I may be wrong, but for question 3(iii), isn't the graph of f^-1 supposed to be a reflection of the graph of f using the line y=x as a mirror?
As for question 7(v), I would like to ask whether it is possible that there is a case where C notsubset B but there is a common area for A inter B inter C (3 separate circles like in case II but C also intersects B)?
About question 11(iii) and 11(v), is the continuity correction supposed to be P(T>2199.5)cc and P(X<10.5) respectively?

32. anonymous commented in tuition class

2010
Nov
13
Sat
10:39am

32

Thanks for the answers(:. But do you mind explaining why for 7(v) the lower limit is 0.03? I got 0.07 though.

My working was
From part ii, and part iv,
as

Sorry, can't type in the last part. Having troubles with the texts but subbing in the values and I get 0.07 as the lower limit.

33. brian commented in tuition class

2010
Nov
13
Sat
10:42am

33

For 11 (v), it should be from -0.5 to 9.5 cos it cannot be negative. qn 3 also need to label y-intercept and max-min coordinates.

34. yk commented in tuition class

2010
Nov
13
Sat
10:48am
35. sh commented in tuition class

2010
Nov
13
Sat
11:00am

35

But our fears are not unfounded because there are many ppl speculating that the min marks to get an A is 90. It seems ridiculous, but considering the difficulty of he paper again, it does seem plausible. ( which i hope not cos i'll be kissing gdbye to by A)....

Can i know if there's error carried forward in A levels maths? and to what extent is it given?

Guess what I can do now is to look forward and think positive. Gdluck to those taking As too this year! 🙂

• 2010
Nov
13
Sat
12:02pm

35.1

@sh: ECF is given only if everybody screws up the question. I reckon question 9 will have ecf if you took into account the lid volume into 300.

That's just my thoughts tho.

• amber replied to sh’s comment

2010
Nov
13
Sat
1:10pm

35.2

@sh: This is what Cambridge wrote on their examiner's comments:

Marks are of the following three types:
M: Method mark, awarded for a valid method applied to the problem. Method marks are not lost for numerical errors, algebraic slips or errors in units. However, it is not usually sufficient for a candidate just to indicate an intention of using some method or just to quote a formula; the formula or idea must be applied to the specific problem in hand, e.g. by substituting the relevant quantities into the formula. Correct application of a formula without the formula being quoted obviously earns the M mark and in some cases an M mark can be implied from a correct answer.

... which should mean that there's ecf for As.

• Anonymous replied to sh’s comment

2010
Nov
13
Sat
2:52pm

35.3

@sh: Like you pointed out those are merely speculations, honestly a 90 for an A looks highly unlikely and if so would certainly draw some amount of controversy

36. David commented in tuition class

2010
Nov
13
Sat
11:03am

36

Graph of 3(ii) (b) looks incorrect - Gradient should be positive initially, becomes negative, go back to zero and then increase once more.

• 2010
Nov
16
Tue
7:01pm

36.1

@David: For Q3(ii)(b), did you do this on your G.C.?

And sketched this?

Do note that to obtain the graph of y2 = x2(x + 2), you'll need to plot
y = ±x√(x + 2) which consists of the graph of y = x√(x + 2) AND the graph of y = −x√(x + 2).

The correct way of using your G.C. would be to plot the curves for y = x√(x + 2) and y = − x√(x + 2) as follows:

37. David commented in tuition class

2010
Nov
13
Sat
11:08am
38. :D commented in tuition class

2010
Nov
13
Sat
11:10am

38

Hi there,
The answers for 10(ii) should be left as 4 decimal places, instead for 3SF.

:]

39. David commented in tuition class

2010
Nov
13
Sat
11:14am

39

For 8(i) you can do it even faster by only considering the first number. Everything else looks fine.

40. val commented in tuition class

2010
Nov
13
Sat
11:19am

40

Good morning! And thanks a lot for the answer.. (: what a relief.

41. Anon commented in tuition class

2010
Nov
13
Sat
11:24am

41

Thanks for uploading! But for question 10 (ii), aren't the r values supposed to be correct to 4 decimal places?

42. cynthia commented in tuition class

2010
Nov
13
Sat
11:29am

42

Hey thanks so much for yur hard work;
Qn 10 partii its supposed to be in 4dp ;D

43. daryl commented in tuition class

2010
Nov
13
Sat
11:45am

43

just one small error i've found, the answers for q10(ii) should be to 4dp as specified by the question and not 3sf.

44. zack commented in tuition class

2010
Nov
13
Sat
11:48am

44

45. Mr Loi Friend Mr Loi on Facebook commented in tuition class

2010
Nov
13
Sat
12:08pm

45

Good morning (or rather good afternoon everyone).

I think a million voices crying out "MR LOI!!! Q10(II) FINAL ANSWER MUST BE IN 4 D.P. NOT 3 SIG. FIG.!!!" have actually penetrated my dreams as I slept last night.

I've uploaded version 1.1 of the solutions simply to correct this, and so as to stem the tide of further comments on this issue. I'm having class now and will attend to the other comments later.

Hope to have your understanding and sorry about the 3 sig. fig. error.

46. banana commented in tuition class

2010
Nov
13
Sat
12:14pm

46

omgawd I got careless mistakes ahhhhhhhhh 🙁

47. somebody commented in tuition class

2010
Nov
13
Sat
12:23pm

47

hmmm if i used z test instead of t test will i be wrong?...cos i still got the same conclusion...i'll prolly get atleast some marks righttt

48. Otto commented in tuition class

2010
Nov
13
Sat
12:37pm

48

Hi Mr Loi, I don't think your answer to 5(i) is appropriate, because the question asks why it is difficult to use stratified sampling, not why it is difficult to get an unbiased/unrepresentative sample... So my interpretation is that the question asks for practical difficulty in carrying out the sampling?

And, after all, isn't a stratified sample meant to capture opinions from different strata for a more representative view? So what's wrong with Europeans having a rather biased opinion? >< It's the same as a stratified sample of boys and girls about the new ballet dance class. Probably girls will like it better than boys, yet this does not mean stratified sampling fails.

49. justfate commented in tuition class

2010
Nov
13
Sat
1:06pm

49

For Question 4v, it is ok if I just write the answer (-infinity to +infinity)?
However, I took the range from the GC straight, would I still get the full three marks?

50. Audrey commented in tuition class

2010
Nov
13
Sat
1:11pm

50

Hello, im wondering the continuity correction for the last question last part should be P(x > 2199.5) instead of 2200.5.

51. sl commented in tuition class

2010
Nov
13
Sat
1:25pm

51

what if i just insert the numbers into the gc for question 1a? do i still get the marks?

52. sl commented in tuition class

2010
Nov
13
Sat
1:34pm

52

sorry... can i ask you for qn 6?... the hypo testing question?... is it wrong? as in... they're asking you to calculate the mean time.. but you sub-ed the numbers inside. shouldnt you do this... x~N(mean,(variance/n))... because the data they gave you is the total. not the mean?

53. Yohanes commented in tuition class

2010
Nov
13
Sat
1:45pm

53

Hello, for qn4(iv), is it alright if I put my answer as 2<x<4 , x≠3?

54. Anonymous commented in tuition class

2010
Nov
13
Sat
2:10pm

54

I was just wondering..

With regards to the hypothesis-testing question, if I keyed in s² [I forgot to square-root to obtain value s], and hence got the incorrect p-value and conclusion, would any marks awarded at all?

55. Kidz commented in tuition class

2010
Nov
13
Sat
2:29pm

55

Question 10(iii), the question clearly asked for reference to 10(i) AND 10(ii)

So other than concluding it based on the r value alone, you need to state the observation that the scatter plot reveals a non-linear relation.
because there is a concave outwards, thus a quadratic equation should be a more suitable model.

56. Anonymous commented in tuition class

2010
Nov
13
Sat
2:30pm

56

Hahas, I made the same mistake too... I wrote down on the paper s but i put in calculator s^2 n got 17%>sig lvl n happily "There's insufficient evident to reject Ho, bla bla bla..." T_T I think they give u 2 marks for the unbiased estimates... but i think mayb there's ECF for our s^2 if our working n our conclusion fits it... But thats my opinion.. At least u get 2 marks ^_^

57. just one question! commented in tuition class

2010
Nov
13
Sat
3:27pm

57

just one question! my friends and I are rather confused about question 10(i). it says "DRAW" the scatter diagram not the usual "SKETCH" we see. does this mean we have to use the graph paper? or only when they "PLOT" then we have to use the graph paper?

thanks!!

58. Anonymous commented in tuition class

2010
Nov
13
Sat
3:52pm

58

I barely scraped a 70% on average for both paper.Guess I shall kiss my A goodbye 🙁

59. Lithilara commented in tuition class

2010
Nov
13
Sat
4:43pm

59

I certainly hope my careless mistake doesn't screw me over. I lost 7 marks from reading qn 8, assuming no method marks, cos I thought it was no. of ways. 🙁 and I thought they wanted f inverse graph for 3iii, Instead of dy/dx. Sighhhh.

60. brian commented in tuition class

2010
Nov
13
Sat
4:56pm

60

For 11 (v), it should be from -0.5 to 9.5 cos it cannot be negative. qn 3 also need to label y-intercept and max-min coordinates.

61. Jt commented in tuition class

2010
Nov
13
Sat
5:57pm

61

For Q11(v), since days cannot be negative I feel that the lower limit for normalcdf should be 0 and not -E99. what do you think?

62. Applemydammple commented in tuition class

2010
Nov
13
Sat
6:31pm

62

Omg i only scored an average of 76 to 77 overall for both papers. theres goes my A and B. next need to retake already. D:

63. anon commented in tuition class

2010
Nov
13
Sat
7:06pm

63

i lost marks for question 8 too): haha but if your paper 1 is good, you'll do fine luh. no worries((:

64. elias commented in tuition class

2010
Nov
13
Sat
7:19pm

64

hi there. for question 11 (v), i believe if you approximate binomial to a normal, your lower limit for normalcdf should not be -E99 but -0.5 instead? since binomial values cannot take on negative values.

65. zack commented in tuition class

2010
Nov
13
Sat
7:54pm
66. orangejuice commented in tuition class

2010
Nov
13
Sat
8:17pm

66

i accidentally used some correction tape during the exam..will they penalise me? :/
and for those who said they have to kiss A gdbye when they get 76-78 i think thats quite...zz.seriously.there is hope since 75 is the min.

67. jimbo commented in tuition class

2010
Nov
13
Sat
8:43pm

67

Hope seems bleak at times like this.
Competitiveness its at its peak and the implementation of the bell curve and paranoia seems hard to ignore.

68. Kidz commented in tuition class

2010
Nov
13
Sat
9:10pm

68

Just stop visiting this page. You are putting extra burden on your remaining papers by being a paranoid and too aware of these competition, which is likely illusionary.

After the paper, you should be conditioning yourself for the remaining papers. Stay confident and don't discuss answers with peers and online =)

I merely look through the method briefly w/o even checking the final answer.just to know that I'm on the right track.

69. reyrtwe commented in tuition class

2010
Nov
13
Sat
9:33pm

69

why are there no answers for h1 math?!?????????????????????????????????????????????????????????????????????????????????????????????

70. Kidz commented in tuition class

2010
Nov
13
Sat
9:44pm

70

opps, i meant extrapolating the competition you see here to the rest of the cohort hahaha.

You know extrapolation is bad 😀

71. untitled commented in tuition class

2010
Nov
13
Sat
10:37pm

71

hi if i get ard 80 plus on average, would i still b able to get an A?

72. untitled commented in tuition class

2010
Nov
13
Sat
10:44pm

72

can someone pls enlighten me? i'm really scared that i cannot get an A.

73. Anonymous commented in tuition class

2010
Nov
13
Sat
10:58pm

73

I got about 60+ for Paper 1 and 70+ for Paper 2, this means getting an A is a no chance anymore right? And why are everyone here getting like 70-80+ on average for both papers! You guys are really smarty pants, should be from the top-end JCs?

74. Anonymous commented in tuition class

2010
Nov
13
Sat
11:20pm

74

Hmm I definitely agree that A should be 70~80. I mean you all are all worried bout getting As (including me)

But technically n logically speaking, the bulk and mean of the belt curve actually lies on B. So, if A hits 85... technically people who are weaker scoring 60+ would be getting C or D... Ouch~.. And people whu gets low 50+ would be scoring S == which seems a lil too extreme...

Ultimately, Cambridge should not be concern wif the large bulk of people getting As, ergo jusifying their actions to raise the bell curve to a 80+ to get As.. raising the bell curve would have detrimental to weaker students.. This seems largely unfair~

And for some whu argued that "My fren nvr do prelim papers or last year paper could get 85+" cannot make the assumption that this generalises over the whole of Singapore.

Our scope of argument only worries bout getting A... how bout the potential weakers student aiming to get B?

Bell curve aims to (most of the time) make grades equally distributed and to reward student for their ability, and not to largely compare whu made more mistakes then the other (which largely would be the reason for not having 100 marks right now, right?). So, try be a lil optimistic (and practical lols...) and dun worry so much of getting B if u had around 80 marks. Cambridge is not out to slaughter us...

Most likely though, there will be stricter marking to balance out~ Eg. -1 for not showing essential steps, statement or presentation seems too messy where workings are everywhere n ur arrows r flying left-right-top-bottom...

75. Anonymous commented in tuition class

2010
Nov
14
Sun
12:29am

75

How do people know the average marks for getting an A for the past few years? Does Cambridge reveal it?

76. Mr Loi Friend Mr Loi on Facebook commented in tuition class

2010
Nov
14
Sun
1:05am

76

Alright everyone I've just uploaded version 1.2 of the H2 Maths Paper 2 solutions in respond to some of the feedback here, namely

• Q3: Inserted nicer, high-tech versions of the graph sketched with turning points properly labeled
• Q7(v): Updated workings to obtain 0.07 ≤ P(A' ∩ B ∩ C) ≤ 0.15 (instead of 0.03 ≤ P(A' ∩ B ∩ C) ≤ 0.15 in earlier version)
• Q11(v): Replaced P(X < 10) with P(0 ≤ X < 10) as the probability to consider, since the lower limit of the number of days X cannot be < 0.

Good night everyone for now!

77. Joel commented in tuition class

2010
Nov
14
Sun
1:08am

77

Hi I was just wondering if you need to times 6C2 for qn11iv because it might be any 2 of the 6 days?

78. Samantha commented in tuition class

2010
Nov
14
Sun
2:09am

78

Hey, i was just wondering about question 6. Since it's a two-tailed test, shouldn't the p-value we are comparing the obtained p-value against be 0.05 instead of 0.1?
Anyway, thanks for the answers 😀

79. hello commented in tuition class

2010
Nov
14
Sun
12:51pm

79

Heyhey thankyou so much for uploading the answer! Anw i have a shorter method to the probablity question q7(iv)
P(A' n C) = P(A n B') + P(B) = 0.32 + 0.60 = 0.92
Draw out the venn diagram and it is quite obvious. Anw iam so worried that the A standard would be like 90 omg. Else my A would be gone. Cos the most i can get is 80 overall. Everyone pray hard that it will be not be too high, perhaps 75. 75 is not v low right HAHA

80. hi commented in tuition class

2010
Nov
14
Sun
11:33pm

80

oh dear how come everyone here's smart ): i seem to be the only one who found the math paper (1) tough because i got stumped by the differentiation qns. am ashamed for asking this but is there any rough gauge as to the passing mark thereabouts? yes i'm that terrible.

81. black commented in tuition class

2010
Nov
14
Sun
11:45pm

81

Hi, isn't the graph for 3 (b) (iii) wrong? I got the asymptote correct but I thought it should starting in the positive region then decreasing to touch x axis at turning pt of original graph then going into negative region and finally increasing to positive again? So end result would be something like U shape but not symmetrical?

82. tak commented in tuition class

2015
Nov
12
Thu
11:52pm
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