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# The Road to Halloween: GCE O Level Oct/Nov 2014 E-Maths 4016 Paper 2 Suggested Answers & Solutions

(8)
Tuition given in the topic of Miss Loi the Tutor from the desk of at 3:11 pm (Singapore time)

Updated on

Greetings everyone!

Welcome to O Level Halloween Week, where the 2014 batch of students are being “trick-or-treated” to one of the most evil O Level timetables in recent memory.

As The Temple is dark and empty of students (who are probably listening to some radio for their Listening Comprehension) as I speak, I managed to hop out of the fridge unnoticed to discover this set of worked solutions on my Mistress‘ desk.

Click the button and grab it here if you dare …

Access it here if you’re having trouble accessing it on Facebook using your state-of-the-art smartphone 🙁

Notes from my Mistress:

1. 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.
2. 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.

Congratulations for surviving the first day of Halloween Week! Hang in there!

P.S. Just found another note on my Mistress’ desk. I think this could be especially helpful to those of you who may simply be exhausted after this “evil” week.

### Revision Exercise

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

1. Spyti commented in tuition class

2014
Oct
27
Mon
5:31pm

1

is there ecf marks for question 5(b)? I did the gradient wrongly and got y=-7/4x+12.
B)part 2 i continued doing and got different answers. Plz help

2. Kom commented in tuition class

2014
Oct
27
Mon
7:30pm

2

Is there ecf marks for qn 7bii if I got qn 7bi incorrectly ?

• 2014
Oct
28
Tue
12:50am
3. Joe commented in tuition class

2014
Oct
27
Mon
9:37pm

3

I made a mistake for question 7b as well since I did not include the length of DA and BC when considering the perimeter so I am also hoping that there will at least be an ecf of 1 mark. For question 6b, aren't we supposed to leave the answer in 3sf? That was what my friends and I all did. With regards to your worked solutions, the probability tree diagram 12/24 should be written as 1/2 isn't it since we are expected to write in the simplest form?

• 2014
Oct
28
Tue
12:41am

3.1

@Joe: Q7(b)(ii): As mentioned in the past, ecf will ultimately depend on the mark scheme but at least this part contains 2 marks so you can only hope.

Q6(b): This has been debated to the death in the past (notice Miss Loi was a lot more cheong hei back then :P). In a nutshell, 3sf only applies when the degree of accuracy is not specified and the answer is not exact (see instructions on cover page).

As the mass of the completed ramp ended up with an exact number (with 3 dp) computed from exact numbers in every step of the workings, strictly speaking, you are effectively decreasing the accuracy of the final answer if you approximated it to 3sf.

But then again, it all depends on how strict the mark scheme is this and Miss Loi has seen many got away with this.

Q10(b)(i): Fractions in simplest form are only explicitly required in Q10(b)(ii). It's just Miss Loi's style to leave it this way in general to facilitate quick checking of all branches in a probability tree diagram 🙂

4. Jill commented in tuition class

2014
Oct
28
Tue
8:25pm

4

hi I've sketched my graph wrongly do u think there will any ecf for question 3? thank u

• 2014
Oct
30
Thu
9:35pm

4.1

@Jill: It's difficult to know as it depends on the marks scheme and how far 'off' your sketched graph is, but your best bet for some marks would be on the correct drawing of the line y=2 in 3(c) and the line in 3(e)(i) and, perhaps, your clear workings for the gradient in 3(d).

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* Please refer to the relevant Ten-Year Series for the questions of these suggested solutions.