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Year 12s: what will be the first way you research your future options? >>

OCR Maths Paper 4 Unofficial markscheme 24th May 2018

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Original post by sammyzo529

the rectangle was -0.5 and 4.5

No that's the value of x and y not the actual lengths and widths

OP

Original post by dumblasagna

What do you mean how???!?!?!???!!
According to what you just said, 1cm is apparently 2.5cm.....
2cm : 5m
2cm : 500cm
1cm : 250cm
1:250
.....

Crap
i didnt no its in metres :frown:

:frown:

Original post by SeanClark

Is this how you are meant to get the circle question:
The angle was 28 i think and that means the other point on the circumference was 28.
Then the angles in a semi circle are 90 degrees
so we use SOHCAHTOA to get the diameter. And its like 13.7 or something like that
then u do pi x 13.7^2, then u get like 145 or something along those lines

Chords in the same segment so to find length BD : 6.4 / sin(28)
Then divide BD by 2, bracket it off and square it then times it by pi to get the area which was 145.96 (5s.f.) if you used exact values like you were supposed to.

Original post by dumblasagna

What do you mean how???!?!?!???!!
According to what you just said, 1cm is apparently 2.5cm.....
2cm : 5m
2cm : 500cm
1cm : 250cm
1:250
.....

It was given in the form 2cm : 5m. The answer is clearly 1cm : 2.5m.

OP

Original post by 13scarbt

It was given in the form 2cm : 5m. The answer is clearly 1cm : 2.5m.

yh i realised

Original post by 13scarbt

It was given in the form 2cm : 5m. The answer is clearly 1cm : 2.5m.

I give up

johnthebaptist27

Original post by dumblasagna

It's being reviewed right now for moderation I have no idea why.
I don't know why you need a variable for population it's just
(0.6x0.2) + (0.4 x W) = 0.216
0.12 + 0.4W = 0.216
0.4W = 0.216 - 0.12
0.4W = 0.096
∴ W = 0.24
= 24%

But it asked for the percentage of the population that arent male but are left handed, so if the percentage of the population who is left handed is 21.6%, how can 24% be correct as it is more than all the left handed percentage?

Original post by dumblasagna

I give up

It's two marks out of a hundred. Don't **** yourself over it.

But it didn't ask for the percentage out of the whole population - it asked for the percentage of out of the women who were left handed.

Original post by johnthebaptist27

But it asked for the percentage of the population that arent male but are left handed, so if the percentage of the population who is left handed is 21.6%, how can 24% be correct as it is more than all the left handed percentage?

That's what I was thinking.

Original post by Ja78975

Was it a 400g:1kg question? What is the value of n: ?

This is OCR higher, I'm not sure what question you're talking about?

oh right ok thought it was a mixture of both.

johnthebaptist27

And about the 1:n question the answer is 250. Look at last year's paper 6, there was a similar question, question 2aii, look at the mark scheme. Paper :
http://ocr.org.uk/Images/470240-j560-06-paper-6-higher-tier.pdf mark scheme:
http://ocr.org.uk/Images/470954-j560-06-paper-6-higher-tier-june.pdf

No it wasn't. It was the percentage of the population who weren't male, but were left handed.

Right ok well my photographic memory is wrong then
(it's 24%)

(edited 5 years ago)

Original post by johnthebaptist27

And about the 1:n question the answer is 250. Look at last year's paper 6, there was a similar question, question 2aii, look at the mark scheme. Paper :
http://ocr.org.uk/Images/470240-j560-06-paper-6-higher-tier.pdf mark scheme:
http://ocr.org.uk/Images/470954-j560-06-paper-6-higher-tier-june.pdf

I don't remember them giving the measurement next to the answer section. If they did, then my bad.

Original post by johnthebaptist27

And about the 1:n question the answer is 250. Look at last year's paper 6, there was a similar question, question 2aii, look at the mark scheme. Paper :
http://ocr.org.uk/Images/470240-j560-06-paper-6-higher-tier.pdf mark scheme:
http://ocr.org.uk/Images/470954-j560-06-paper-6-higher-tier-june.pdf

Why you stressing about the one marker?

Original post by TrashMouse1

it was 2.5 not 250
from 2:5 to 1:2.5

it was 2CM to 5M
therefor convert to centimeters: 2:500
1:25

Dont worry, i made the same mistake but noticed when i checked back through

Original post by 13scarbt

It's two marks out of a hundred. Don't **** yourself over it.

I'm not I was correct why would I be?

Original post by dumblasagna

Right ok well my photographic memory is wrong then
(it's 24%)

"Photographic memory" lol. Whatever you say.

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