Additional Maths OCR

Competition - post a photo you've taken of nature >>

Scroll to see replies

Wow someone else got 350, hope we were right 2-350 and about 3 say 500....

Im bated I lost 10 marks or so cuz of stupid mistakes. What you think the grade boundaries are on such an easy paper?

Reply 21

The West Wing

clowes

Yeh I got that wrong cuz Im an idiot, but your have to get like 4 answers...

It was 63.4 and 180+63.4 (shape of tan graph) which was 243.4

Reply 22

clowes

Oh ok, what question did you use simultaneous equations on? I cant remember...

Reply 23

alpesh24

miltonkeynes

It was 63.4 and 180+63.4 (shape of tan graph) which was 243.4

that is right, and my graphics calculator prooved it correct during the exam :p:

it came in use, as i drew the graph wrong, and the calculator showed my a different area of shading, which i later found out to be the correct one

Reply 24

calcium878

Answers of mine that I can remember:
Q1 - integration = 14 2/3 units
Q5 - inequalities x>1 x<-5
kinematics - 500 seconds longer
tan identity, 63.4, 243.4

Overall VERY easy in my opinion, last year's was much harder

Reply 25

belli

thanks guys i cant believe this i seriously expected to not be able to answer a single question and so far i seem to have answered quite alot right even the integration one. yay!

Reply 26

The West Wing

calcium878

I agree with all of those answers, although for 5 I wrote it as "-5>x>1" which is the same...

Reply 27

calcium878

miltonkeynes

I agree with all of those answers, although for 5 I wrote it as "-5>x>1" which is the same...

It is indeed, I'd have thought it'd count either way, hopefully.

Anyone else remember any other questions, other than the proof/graph/fiddly probabilities?

Reply 28

belli

for first proabbility i did 65/100^5 i knwo thats the and rule but i did the choose way and ended up with same answers then did 3 s.f ne1 else?

Reply 29

The West Wing

calcium878

It is indeed, I'd have thought it'd count either way, hopefully.

Anyone else remember any other questions, other than the proof/graph/fiddly probabilities?

For the last question on the first page 'prove why these two have the same gradient'

Did you just divide it by two and point out that y=mx+c was the same?

I hate proofs :rolleyes:

Reply 30

The West Wing

belli

for first proabbility i did 65/100^5 i knwo thats the and rule but i did the choose way and ended up with same answers then did 3 s.f ne1 else?

Yes that's what I did too.

5C5 = 1 and so does (35/100)^0

So it doesn't really matter.

Reply 31

calcium878

miltonkeynes

For the last question on the first page 'prove why these two have the same gradient'

Did you just divide it by two and point out that y=mx+c was the same?

I hate proofs :rolleyes:

Yes, I just put they both had a gradient of -2.45 and hence are parallel (it was only 2 marks so I think that's all they wanted).

Also, for the question after (the perpendicular line equation) I got y=0.4x + 5.6

Reply 32

belli

ok i actually cant believe this first gcse amths and now add maths have gone well for the first time ever. ok for for the 7 marker did u do simultaneous equations and use the formula?

Reply 33

The West Wing

belli

ok i actually cant believe this first gcse amths and now add maths have gone well for the first time ever. ok for for the 7 marker did u do simultaneous equations and use the formula?

Yes,for the first half

Then put it into the original equation and get y.

It was someting weird like 1-root17

Reply 34

calcium878

miltonkeynes

Yes,for the first half

Then put it into the original equation and get y.

It was someting weird like 1-root17

Yup, it was 1 +/- root 17

Then you had to sub these back into the linear equation to get two pairs of co-ordinates.

Reply 35

clowes

I got like (16,32) and (18,34) for the co-ordinates, is that right???
Also for the prove they are parallel I got one gradient as 2 and one as -2 which Iguessed meant they were the same... right/wrong?

Reply 36

The West Wing

clowes

If the question is 'Prove why both have the same gradient' I don't think they'd want to trick you like that (unless it's edexcel :wink:

)

The cooordinates was 1 - root 17 and 1+root17 and whatever that came out to be for the original (something like 3+2root17 but I can't remember)

It did say "two decimal points" in that question too

Reply 37

clowes

Agh Crap, I have done awful

Reply 38

The West Wing

clowes

Agh Crap, I have done awful

I'm sure you haven't. In Add Maths it's only 1-2 marks for the answer, if you have the right method you get marks. You also get marks for stating formulae (like y=mx+c) so you'll have done reasonably well even if you got wrong answers

Reply 39

Swayum

For the probablity ones:

1) 5C5 * 0.65^5 * 0.35^0 - All 5 people
2) 5C4 * 0.65^4 * 0.35^1 - Exactly 4 people
3) 1 - (5C0 * 0.65^0 * 0.35^5 + 5C1 * 0.65^1 * 0.35^4) - At least two people
4) 10C8 * 0.65^8 * 0.35^2 - Group of 10, exactly 8 people.

Did everyone else get those too? I wasn't sure because they were giving SO many marks for such little working...