HSC Advanced Mathematics Predictions / Thoughts (1 Viewer)

donutsausage

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Anyone know what the answers were for Q8 and Q10?
I got 3 for 10 but I'm not sure whether the middle one is a cusp or not, I'll do some investigating when i get home.

EDIT: It seems its continuous for the middle st pt so it's 3
 

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AuroraXT

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Booklet 2 threw me off quite a bit. Was not expecting the 5 mark cricket regression question (tragic). Somehow ended up getting (a+1)^4 as one of the integrals for 4 mark area between two curves question and I just stopped their. Second last question, I was a bit clueless, found the derivatives of the 2 trig curves but not sure when they were both increasing at the same time, probably messed up the last question too. Booklet 1 went well but it was only 32 marks so ;/
 

mmmm.

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How did you guys get the cricket question?
 

Kangaaroo

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How did you guys get the cricket question?
You needed to find the average temperature (which was 0.565 or something below the median from the box-and-whisker plot) and the average number of chirps per recording. Using these two values you get a point (x, y) which the least-squares regression line passed through. Subbing in that point you can solve for b, and that gave you a complete equation with which you could sub in x=19.
 

jojosiwa123

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does anyone remember roughly what details they gave in the cricket question extract and what the question actually was? It’s killing me not knowing, I wanna try it again lmfao
 

jojosiwa123

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omg that would have been okay if i studied but here i am with probably sub 10 percent 🤡
same... I felt like the paper in itself was pretty easy tbh especially section 1. I just wish I actually fking studied bc I know I couldve done it well, I just didn’t know how to apply what I learnt to test questions oh well
 

mmmm.

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Does anyone remember the investment question? and what did you guys get for the 94th withdrawal?
 

#RoadTo31Atar

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Does anyone remember the investment question? and what did you guys get for the 94th withdrawal?
I remember $60 000 at 0.5% interest monthly, she withdraws $800 after interest is applied - don't remember my answer tho
 

JaidynK99

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omg anyone remember the question asking how much money would be left in the account after 94 withdrawals? one kid in my year sat there and did it 94 times instead of using a formula HAHAH omg poor guy
OMG you just made my day. Thanks so much!
 

JaidynK99

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I got 3 for 10 but I'm not sure whether the middle one is a cusp or not, I'll do some investigating when i get home.

EDIT: It seems its continuous for the middle st pt so it's 3
wait, so is it 3 roots or inflection points (or something) then?
 

khaledmz

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Does anyone remember the investment question? and what did you guys get for the 94th withdrawal?
60000(1.005)^94 - 800(1+1.005+1.005^2.....+1.005^93)

Bold
= Geometric series, so u substitute in the formula (a=1, r=1.005,n=93), and then you get your answer :) i think it was roughly $900, give or take.
 

JaidynK99

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does anyone remember roughly what details they gave in the cricket question extract and what the question actually was? It’s killing me not knowing, I wanna try it again lmfao
honestly, it was like. the scientist record the cricket sounds every 15 minutes and the box plot ranged from like (not sure) 15 to 24 or something, cant remember sorry. There were like 468 cricks and they wanted us to find the expected value of the cricks at 19 degrees cel.
 

mmmm.

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1603704467849.png
Like this right?

EDIT: I meant to put 94 instead of the 93
 
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ashvish7

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Thank god, i had a blank in the exam and spent like 2-3 mins thinking if it's 93 or 94
I was looking at this thread like -_-, cause I thought I did it wrong aha, but I'm glad its 94
 

vivswithluv

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Can someone tell what the working out was for the proof for sin tan question?? lmao I felt like an idiot trying to figure it out,,
 

ashvish7

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Can someone tell what the working out was for the proof for sin tan question?? lmao I felt like an idiot trying to figure it out,,
oooh I think I got that one, but do you remember the left-hand side of the equation... cause I forgot
 

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