* … continued from here.*

**BANG* *SLAP**

Professor Loi, I managed to start it up again!

said The Expedition Leader as a logo of a fruit lit up the dusty screen of the iPad Air.

What have I always told you about China-made nuclear products? *tsk tsk*

Anyway, let’s see what happened on O Level EMaths Paper 2 in 2013! I can literally feel their excitement a millennium later!

*

giggles and jumps up and down like a siao char bor*

#### The Walls Whisper My Name

The last AMaths student has just left The Temple, leaving me alone to scribble out the much-demanded **2013 O Level EMaths 4016 Paper 2 suggested solutions**, under the glare of the majestic Wall of Gratitudes.

Fending off the irritating drilling from the renovation works at Udders Ice Cream downstairs, as well as the despairing fact that the United Square foodcourt has closed for the day (which means another 吃风 night), I focused on the task at hand, with only the silent encouragement from the words on the Wall to spur me on …

Click the button and grab it here!

As usual, please, please leave a comment should you spot any mistake in the solution. AMaths *joss sticks* sessions ended late tonight 🙁

**Note:**

- Before you ask questions like “I lost
`x`marks in Paper 2, can I still get A1/A2/B3/B4/pass?” or “What is the cutoff for A1/A2/B3/B4/C5/C6/D7/E8/F9 this year?”, please understand that Miss Loi is NOT the Bell Curve Goddess. - Please also understand that, unless things have changed, there is no half-mark awarded in O-Level Maths. Also it is nigh impossible for ECF if the part involved only carries 1 mark.

I wish all those taking AMaths Paper 1 tomorrow **All THE VERY BEST**.

Till the next journal entry …

*self power-off*

## 20 Comments

曜

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Ms Loi! why is standard deviation the same 🙁 i wrote that but after reading again, the question is like saying that how it changes. 🙁 why... last qn btw.

曜

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@changing-too-much: The standard deviation measures the

spreadof a set of data from its mean.In Q10(iv), it was found that the heights were

all5 cm less than what was recorded⇒ all values have fallen by 5 cm but spread is unchanged.

To put this (very) simplistically, for e.g. A's height is 20cm while B's height is 10 cm.

The difference in their heights (as a rough measure of A's 'spread' from B) is thus

20 cm − 10 cm = 10 cm.

If both A and B's heights are reduced by 5 cm, A's height becomes 15 cm and B's height becomes 5 cm.

But the difference in their heights is still 15 cm − 5 cm = 10 cm

If you still don't believe Miss Loi, here's a detailed calculation of the "new" standard deviation after all heights are reduced by 5 cm

xffxfx²New standard deviation = ≈ 9.12 (3sf)

= Original standard deviation!

曜

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Miss Loi if i estimate that i score 93% for overall do you think is an A1 or A2

曜

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May i know the acceptable gradient range??? is it plus minus one?

ALso for 6bii, can i just calculate QP and halved it or must i prove its similar... will i get any marks if i did not prove similar???

曜

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@vonne: Yes there'll always be a tolerable range of answers when it comes to graph plotting questions. Every year, Miss Loi has to say this:

For Q6(b)(ii), since it's been given as a

regularhexagon, we can probably assume thatOAbisects ∠QAP(actually this is an obscure property of regular polygons) and henceQX=XP.So though it may not be necessary to go through the similarity proof, it's good to at least state something like the above just to be on the safe side, even though this part only carries 2 marks.

曜

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Hi Miss Loi! Would like to ask, as for qns 4aii.) Is the ans 'n^2 + 2' , accepted? Or do you have to add the extra 'n' after '..+2' ?

曜

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@Ace: Ok i know why already!

曜

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@Ace: o.O

曜

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Hey, just a question. For q8, the whole question i used the correct method but calculation was off. I took OB=sin20 x 0.6m instead of 0.6/sin20. And my whole question was wrong, will there be any ECF to make up for the heavy loss of marks? T_T

曜

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@JeeeepJeep: Depends on the mark scheme but maybe, just maybe, you'll get something out of Q10(a)(iii) and (b) which has a total of 8 marks to spare for some method marks.

Only if you have very clearly showed the

correct application of formula and stepsin your workings though.曜

日

Hey, For Qn8 (aiii) can i leave my answer to 3sf which is $162 instead of $161.97 since the cover page mentioned "non exact values to 3sf" . PLEASE LET ME KNOW IT MEANS SO MUCH TO ME T-T

曜

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@Tan Xin Yu: Since cents are stated in Q8(b), Miss Loi's afraid that the required degree of accuracy has to be ...

♫ MONEY MONEY MONEY ♪

♫ AND CURRENCIES ♪

♪ SHOULD BE IN 2 D.P.! ♪ ♫

Full lyrics on Joss Sticks facebook page.

曜

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I got 9 marks gone for paper 2

is it possible for me to still get a1 if my paper 1 only got three marks gone?

曜

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Hey. What if I change the angle in radian wrongly but the subsequent parts need to make use of the angle in radian. Will I get the full marks for the subsequent question if I use the correct method but wrong angle? Thanks!

曜

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@confused: Q8?

曜

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@Miss Loi: Yes. I got the angle in radian mode wrong but the subsequent parts i used the corect method but with the wrong angle. Will there be error carry forward? 🙁

曜

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Miss loi, for question 8 what if i take 180/pie *40 instead of pie/180*40 to fins angle in radian, will they give me me

thod marks?

曜

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Hi All

I found the suggested solution and answer only. where can I get the question paper?? Please

曜

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@sai: Unfortunate, this

willhappen if the question papers are posted here 🙁You'll just have to wait patiently till next year for the authorized publishers to produce them.

曜

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Hi, do i need to leave percentage in exact form or3sf? I am referring to qns 10 bi)