GCSE Edexcel Maths Unit 3 19/06/2012 Exam Discussion

Sorry, i didn't quite understand?

Look, the mark you needed for an A* in THIS EXAM, NOT OVERALL was 144/160 UMS. For an OVERALL grade, you needed 90% overall. Total marks for all 3 exams is 400, with the first two units both being out of 120 UMS, and unit 3 being out of 160. So if you add your unit 1 and 2 marks together, and minus it from 360 (90% of 400), then you'll know what you needed overall for an A*

F*ck, I got 69/80... needed 82.5% for A*, now thats over 86% but according to some people That won't be enough as they will raise boundaries. I made retarded mistakes, like I thought the divide sign was a plus sign and I did the whole cone question as you would for a cylinder... Please tell me I should be ok with 69... I got 116/120 and 114/120 in the other units.

for the last question, i got 3.65 (3sf). it was an equilateral triangle i assumed the other side would also be 5.6, then i used the sine rule? /:

That's what I did as well. I was taught it that way as well so i hope I get full marks

So annoying, checked the unofficial mark scheme and got 79/80 because I forgot to use dotted lines in the inequalities question.

for the last question, i got 3.65 (3sf). it was an equilateral triangle i assumed the other side would also be 5.6, then i used the sine rule? /:

There is a glimpse of hope

you can't assume anything was an equilateral triangle, because it shows you that the sides and angles were different to each other for both triangles. Equilateral triangles will have 60 degrees for all it's internal angles and equal length sides.
So that mean you had to use cosine rule to work out one of the sides (can't remember what the questions labelled the sides as) which is a^2=b^2+c^2-2bcCosa.
After that, I'm not sure what you should have done because i tried sine rule (a/Sina=b/Sinb and re arranging it), then I tried going round the triangle using the Cos=Opposite/Hypotenuse etc. (SOH CAH TOA, if that makes any sense to you)

Hi I got 96 ums in both unit 1 and unit 2 the I counted about 60 in this paper, do you think that would scrape me enough UMS to get an A overall?

You need 320 UMS marks to get an A. So u already have 192 marks so in the Unit 3 paper u needed to get 128 UMS marks to get an A. that is about 64 points. So hopefully u got 64 points

oh no, i don't think i got above 60, let alone 64, do you think they will have lowered the grade boundaries because we're the first year to sit the exam?

Hi I got 96 ums in both unit 1 and unit 2 the I counted about 60 in this paper, do you think that would scrape me enough UMS to get an A overall?