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Math Advanced Prediction/Thoughts (1 Viewer)

CopperPike

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Raw mean mark for last year's exam was 38.1/50 and scaled was 28.4/50. I wonder how our cohort's stats will look like .
 

Jerryclover

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oh i didnt see that, i was more so wondering why u thought it was difficult for adv
ah, ok. I was more so referring to the entirety of q26. If i hadn't doen extension 1, i would never make the connection to substiute y(t)= 0 for 26b. This is very similar to ext1 projectile motion questions, so yeah
 

5uckerberg

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I know some of the solutions are wrong in this pdf I agree with CM_Tutor and Trebla.
View attachment 33772

I don't know if this was mentioned previously...but as the question asks for height above ground level, shouldn't the answer be 445m (so 345+100 above ground level)?
I find the second part is extremely questionable. I mean can you remove a factor of 5 from the question?
 

CopperPike

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Honest estimation, a 77-81 raw will amount to an 89-92 scaled this year. Last year the examination wasn't too bad, with the exception of the cricket question (which wasn't even bad at all). 2021, comparatively, will have a greater spread of results and a smaller percentage of those in the top 1-0.001%. The raw mean mark will be a lot lower.
Hopefully… we will have to wait and see.Yeah the 2020 was quite a breeze. 2013 wasn’t that bad at all, and 75 was scaled to a band 6. I reckon the cutoff will probs be 73 (maybe) but more close to 74-75 imo
 
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Honest estimation, a 77-81 raw will amount to an 89-92 scaled this year. Last year the examination wasn't too bad, with the exception of the cricket question (which wasn't even bad at all). 2021, comparatively, will have a greater spread of results and a smaller percentage of those in the top 1-0.001%. The raw mean mark will be a lot lower.
praying u r right
 

CM_Tutor

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Q25's solution is very messed up. I mean what were they thinking.
Q25 is the exact sort of mistake that everyone should be checking for after each answer by asking yourself "is my answer reasonable?" As several people have noted, turning $8,000 into over $60,000 in 8 years at less than 1% interest pa = unreasonable. Just like the normal distribution / number of babies question, where the given answer is also obviously unreasonable.
 

CM_Tutor

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I know some of the solutions are wrong in this pdf I agree with CM_Tutor and Trebla.

I find the second part is extremely questionable. I mean can you remove a factor of 5 from the question?
Is it just mean, or is the arithmetic in 26(b) wrong? isn't it ?
 

CM_Tutor

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Oops, I'm wrong... I read their working for the time as



but I have misread and it is actually

 

5uckerberg

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Oops, I'm wrong... I read their working for the time as



but I have misread and it is actually

Then by default, it has to be for the velocity as the particle reaches the ground noting that the negative represents slowing down.
 

CM_Tutor

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Then by default, it has to be for the velocity as the particle reaches the ground noting that the negative represents slowing down.
Yes and No.

The velocity at impact with the ground is indeed or in a downwards direction. The particle is not slowing down, however, it is speeding up as it is accelerating in the negative direction and moving in the negative direction.

Note, also, that while this is an example of projectile motion, the particle has been projected vertically and so all of the motion is occurring in one dimension, as is typical in Advanced Maths motion questions. What makes it unusual is that motion is all vertical rather than all horizontal along an -axis.
 

RaymondB

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Guys for the second short answer I used tan instead of cos, what is wrong with me (also how many lost marks is that, will I at least get maybe 2 pity marks pls cause I did the right working out, wrong trig identity)
 

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