OCR maths gcse higher paper 3 12th June 2018 unofficial markscheme

I found it the hardest exam :frown:

Reply 2

Was it isocoles: yes
Height of pyramid: 20.1 cm
K: -17.5

Reply 3

Original post by mathsscience1

Was it isocoles: yes
Height of pyramid: 20.1 cm
K: -17.5

The only question so far that I have discovered I got incorrect was the pyramid question: I stupidly forgot to halve the volume of the sphere to make the hemisphere.

Reply 4

what did you get for the value of that r and t question with the sample space? And the compound interest one?

Reply 5

Ping's numbers: 8,8,13,15
7272 bricks (although unlikely because not all the bricks are going to weigh the lower bound: some may be heavier)
Sample space question: u=14
Final question: yes, because it can be rewritten as (x-4)/(x-2)

Reply 6

Original post by ap35cc

Yes i got those, phew. For some of the questions, the answer was in pi, did you leave it in pi or convert it?

Reply 7

Original post by Hamburguessa

what did you get for the value of that r and t question with the sample space? And the compound interest one?

Compound interest: 7.2%
Sample space: u-14, r-5, t-2
Or something like that

Reply 8

Original post by Hamburguessa

Yes i got those, phew. For some of the questions, the answer was in pi, did you leave it in pi or convert it?

I usually converted it

Reply 9

TrashMouse1

What did u get speed for kmph

Reply 10

Original post by TrashMouse1

What did u get speed for kmph

21.6

Reply 11

TrashMouse1

Original post by ap35cc

21.6

i got 50

Reply 12

Original post by ap35cc

21.6

I got that

Reply 13

I'm sorry to tell you that you're incorrect. the max. speed was 6 m/s, which is 21.6 km/h

Reply 14

joey935

the triangles were similar, the bigger triangle has a scale factor 0.5root5 of the smaller one.

Reply 15

johnthebaptist27

what was the question for the bricks mass?

Reply 16

joey935

Original post by johnthebaptist27

what was the question for the bricks mass?

55000 i got and it's unlikely because they won't all be exactly that lowest value

Reply 17

what did you get for the two statements about the cookie factories? time was running out and i couldn't think of anything,

Reply 18

johnthebaptist27

Original post by joey935

55000 i got and it's unlikely because they won't all be exactly that lowest value

I used the upper bound for some reason kmn, but how did you get 55,000 and my reason was that ytou probably couoldnt fit all the bricks onto one truck

Reply 19