Maths Studies 2012 TZ2 Exam Discussion
Discussion forum for International Baccalaureate students.
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Re: Maths Studies 2012 TZ2 Exam DiscussionYeah, I realised that afterwards(Original post by Superwoman)
yeah I remember that one, you had to use the vertex to calculate b and then use the points given to calculate c
... It didn't help that we never got taught that in class! Ah well, it's only 6 marks, I was never aiming for a 7!
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Re: Maths Studies 2012 TZ2 Exam Discussionahh don't worry i self taught myself the whole course(Original post by KetchupSandwich)
Yeah, I realised that afterwards
... It didn't help that we never got taught that in class! Ah well, it's only 6 marks, I was never aiming for a 7!
on the derivatives question the gradient was 6/2 which I wrote down as 2 instead of 3, will hopefully get method marks for it but I wrote all my working out in pencil
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Re: Maths Studies 2012 TZ2 Exam Discussion(Original post by KetchupSandwich)
It was a -x^2 graph with intersects on (3,0) and (5,0) with a vertex of x coordinate 3. You had to find b and c (as in -x^2 + bx + c or something) and the range of the function. Couldn't do it!
Oooh, did anyone get 6 for b and -5 for c? Or something like that...Then the range values came out weird...like 14, 5, 0, 3...(Original post by Superwoman)
yeah I remember that one, you had to use the vertex to calculate b and then use the points given to calculate c
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Re: Maths Studies 2012 TZ2 Exam Discussion(Original post by beautiful-lion)
Oooh, did anyone get 6 for b and -5 for c? Or something like that...Then the range values came out weird...like 14, 5, 0, 3...
yepp it was 6 and -5
and for the range I think it was -14 to 5 or -5 to 14 something like that 
for paper 2 did you put down continuous or discrete for question 3? -
Re: Maths Studies 2012 TZ2 Exam DiscussionDiscrete. I nearly put continuous, because I saw time, but I realised it was actually discrete because it was referring to the people in the supermarket.(Original post by Superwoman)
yepp it was 6 and -5
and for the range I think it was -14 to 5 or -5 to 14 something like that 
for paper 2 did you put down continuous or discrete for question 3?
What did people get for the mean in that question? I think my GDC did it wrong :/
And q1 was so confusingly worded! And no graphs at all! -
Re: Maths Studies 2012 TZ2 Exam DiscussionI put down continuous too, but I have no idea about it!(Original post by momentalus)
continuous I think was the right answer. How was question 5 to every one, I solved it but I do not think I was right.
for question 5 i got two tins at the end, anyone else?
I was totally confused about continuous or discrete! didn't know which to put and just ended up with continuous(Original post by beautiful-lion)
Discrete. I nearly put continuous, because I saw time, but I realised it was actually discrete because it was referring to the people in the supermarket.
What did people get for the mean in that question? I think my GDC did it wrong :/
And q1 was so confusingly worded! And no graphs at all!
I think the mean was 21.5? I honestly can't remember
for q1 some of the probabilities were worded in a weird way yeah -
Re: Maths Studies 2012 TZ2 Exam DiscussionYeah, I added up the mean by hand and got 21.5, but my GDC told me 25, so I put that :/(Original post by Superwoman)
I put down continuous too, but I have no idea about it!
for question 5 i got two tins at the end, anyone else?
I was totally confused about continuous or discrete! didn't know which to put and just ended up with continuous
I think the mean was 21.5? I honestly can't remember
for q1 some of the probabilities were worded in a weird way yeah
I'm preeeetty sure it was discrete, as 'number of people' can't be continuous. It was only 1 mark though I think.
And yeah, I got 2 tins of paint (well, 7.8334... litres of paint, meaning 2 tins overall). I'm fairly sure that's correct. I thought q5 was very satisfying - when it's like "prove that V=this", you know you've got it right!
Question 1 knocked my confidence, because I find probability easy, but didn't really understand what it was asking. And when it said 'use your answer to part e) to find the probability of her catching a fish on 2 consecutive days', I used my working to part e) (I squared it) but not the actual answer :/
I thought the other questions were fine though - graphs can be hard, but there weren't any
Does anyone remember what they got for the 90th percentile question? Something like 38.5?
And the pyramid/financial question? (I thought that 'Cedric' was v cheeky to invest the money his mum loaned him for a car!) -
Re: Maths Studies 2012 TZ2 Exam DiscussionPretty sure it's discrete. While time would be continuous, it was the number of people which was measured - and that can be counted and thus is discrete. That was my reasoning anyway.(Original post by Superwoman)
I put down continuous too, but I have no idea about it!
for question 5 i got two tins at the end, anyone else?
I was totally confused about continuous or discrete! didn't know which to put and just ended up with continuous
I think the mean was 21.5? I honestly can't remember
for q1 some of the probabilities were worded in a weird way yeah
Also, it's usually been discrete on past papers. :P -
Re: Maths Studies 2012 TZ2 Exam Discussion(Original post by beautiful-lion)
Yeah, I added up the mean by hand and got 21.5, but my GDC told me 25, so I put that :/
I'm preeeetty sure it was discrete, as 'number of people' can't be continuous. It was only 1 mark though I think.
And yeah, I got 2 tins of paint (well, 7.8334... litres of paint, meaning 2 tins overall). I'm fairly sure that's correct. I thought q5 was very satisfying - when it's like "prove that V=this", you know you've got it right!
Question 1 knocked my confidence, because I find probability easy, but didn't really understand what it was asking. And when it said 'use your answer to part e) to find the probability of her catching a fish on 2 consecutive days', I used my working to part e) (I squared it) but not the actual answer :/
I thought the other questions were fine though - graphs can be hard, but there weren't any
Does anyone remember what they got for the 90th percentile question? Something like 38.5?
And the pyramid/financial question? (I thought that 'Cedric' was v cheeky to invest the money his mum loaned him for a car!)
I did it as if it was the time being measured not the people - oh well yea its one mark
and yeah got exactly the same for question 5, and I actually thought it was easy because of the prove thing so you're sure that it's right!
for the probability one I just multiplied my answer to e) by two which I know is probably wrong but I couldn't find anything else to do hahah
pyramid one was alright as well, but you had to know triangle theory and all that
and the finance one was alright as well
overall I think it was a pretty okay exam compared to what they had put previously
hahaha I thought it was the time not people but yea you're probably right(Original post by Saelie)
Pretty sure it's discrete. While time would be continuous, it was the number of people which was measured - and that can be counted and thus is discrete. That was my reasoning anyway.
Also, it's usually been discrete on past papers. :P -
Re: Maths Studies 2012 TZ2 Exam Discussion
I don't know how to feel about paper 2- it seemed pretty straightforward (apart from the insanely irritating probabilities) but it was so time consuming. I didn't have time to check and I now realise that I've got the very last question wrong (forgot it had to be the number of tins, so I put something ridiculous). I'm *hoping* it went well. I found it quite simple while I did it but I'm really good at making stupid mistakes :/ I loved the geometry one though, very satisfying
Fingers crossed for a 6!
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Re: Maths Studies 2012 TZ2 Exam DiscussionI think the grade boundaries will be a bit higher than usual because the exams were easier than usual(Original post by Ibstudent20)
what do you guys think will be enough for a 6 this year ?
and what were the topics on paper 1 i want to see how i did against them
can't remember much of paper 1 but there was arithmetic and geometric sequences, probabilities, chi squared, about 3 function questions, calculus .. -
Re: Maths Studies 2012 TZ2 Exam Discussionthe one with 'show that' for everything? It was alright I guess, looking at past exams I think it could have been much worse(Original post by icnthelpit)
Did anyone else find that last question on paper 2 horrible? I had to completely guess it :/ -
Re: Maths Studies 2012 TZ2 Exam Discussionyeah, with the volume of a prism in algebra and showing that it equalled somehting else.(Original post by Superwoman)
the one with 'show that' for everything? It was alright I guess, looking at past exams I think it could have been much worse
I disagree, I prefered some of the other past papers. It may just have been me blanking out, or over complicating it, but I found it horrible
also, the graph one (cumilative fruency) when you mark the points on the graph, do you mark them as the midpoint (at 5) or at the top (at 10)? -
Re: Maths Studies 2012 TZ2 Exam DiscussionWhat did you get?(Original post by icnthelpit)
Did anyone else find that last question on paper 2 horrible? I had to completely guess it :/
I thought it was ok if you 'got' the first parts, but I suppose it was hard if you didn't. I found q1 the hardest though, so I'm weird
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Re: Maths Studies 2012 TZ2 Exam Discussionat 10 because I think it said to mark them at 10(Original post by icnthelpit)
yeah, with the volume of a prism in algebra and showing that it equalled somehting else.
I disagree, I prefered some of the other past papers. It may just have been me blanking out, or over complicating it, but I found it horrible
also, the graph one (cumilative fruency) when you mark the points on the graph, do you mark them as the midpoint (at 5) or at the top (at 10)? -
Re: Maths Studies 2012 TZ2 Exam DiscussionI didn't ge the first parts at all, but i wrote out all the method etc, so I'm hoping I get a few method marks(Original post by beautiful-lion)
What did you get?
I thought it was ok if you 'got' the first parts, but I suppose it was hard if you didn't. I found q1 the hardest though, so I'm weird
Question one? was the the probability one? there was one part of it i wasn't too sure about, but other than that I thought it was ok
I made sure I had covered that well because it seemed to pop up in every exam 
I sat 3 hours of maths exams at once, so maths overload! :L so glad those three days are over!
How did you find paper one? -
Re: Maths Studies 2012 TZ2 Exam DiscussionI thought paper 1 was ok, apart from I was being stupid on a few questions (14 - the triangle one!). So I know I've lost 6 marks, but hopefully not much more than that. Still hoping for a 7!(Original post by icnthelpit)
I didn't ge the first parts at all, but i wrote out all the method etc, so I'm hoping I get a few method marks
Question one? was the the probability one? there was one part of it i wasn't too sure about, but other than that I thought it was ok
I made sure I had covered that well because it seemed to pop up in every exam 
I sat 3 hours of maths exams at once, so maths overload! :L so glad those three days are over!
How did you find paper one?
Not sure what grade boundaries will be like though...
on the derivatives question the gradient was 6/2 which I wrote down as 2 instead of 3, will hopefully get method marks for it but I wrote all my working out in pencil
