[Ivo]

(Original post by Mr M)

Thanks Mr M for your answers. For Q5 ii) I drew a dotted line of y = x and labelled it, then drew the inverse function as a solid line but stupidly didn't label that, would I get away with it? Also, for iii) I got all the bits in brackets right but instead of multiplying it by 2/3, I multiplied it by 1/6 (again stupid mistakes). As it's a 4 marker rather than a 3, would I lose 2 here or just the 1? For Q8 i) I got as far as but then made errors after this so didn't get it in the required form - would I scrape 1 mark for this? And for Q9 iii) I proceeded to find the co-ordinates of the max. point of -f(x) and my y coordinate was -4k, and so subsequently I initally got k = -5, and then said it was k = 5 because I wanted value for |f(x)|, then formed a quadratic but didn't bother to use the quadratic formula and just plugged them into my calculator's equation solver to get the two solutions , so my final answer was the three required as I already found the x coordinate of the max point. But actually I've checked through and realised that it was just a silly error and in fact my answer should have been k = 5 and not k = -5. Will they notice I fudged my k value a bit?

[Smiley Face :)]

Any one think this exam was harder than june 2011... or about the same?? Let me know please!

[Mr M]

(Original post by Ivo)
Thanks Mr M for your answers. For Q5 ii) I drew a dotted line of y = x and labelled it, then drew the inverse function as a solid line but stupidly didn't label that, would I get away with it? Also, for iii) I got all the bits in brackets right but instead of multiplying it by 2/3, I multiplied it by 1/6 (again stupid mistakes). As it's a 4 marker rather than a 3, would I lose 2 here or just the 1? For Q8 i) I got as far as but then made errors after this so didn't get it in the required form - would I scrape 1 mark for this? And for Q9 iii) I proceeded to find the co-ordinates of the max. point of -f(x) and my y coordinate was -4k, and so subsequently I initally got k = -5, and then said it was k = 5 because I wanted value for |f(x)|, then formed a quadratic but didn't bother to use the quadratic formula and just plugged them into my calculator's equation solver to get the two solutions , so my final answer was the three required as I already found the x coordinate of the max point. But actually I've checked through and realised that it was just a silly error and in fact my answer should have been k = 5 and not k = -5. Will they notice I fudged my k value a bit?

Q5 prob ok for the graph

lose 2 next bit I think

1 mark for Q8.

they *might* not notice your fudge

[Ivo]

(Original post by Mr M)

Ah OK thank you! Just out of interest, if they notice the fudge do they not credit anything further? Also, for the iterations I showed working for the first iterate, and then didn't bother and just wrote down a few more values. Would that be OK?

[Mr M]

(Original post by Ivo)
Ah OK thank you! Just out of interest, if they notice the fudge do they not credit anything further? Also, for the iterations I showed working for the first iterate, and then didn't bother and just wrote down a few more values. Would that be OK?

They should read it all. So long as you listed your iterations that is fine.

[minip12qss]

[QUOTE=Mr M;35974285]Mr M's OCR (not OCR MEI) Core 3 answers January 2012
8. i)

k = 8 (3 marks)

ii) (2 marks)

iii) 2 and -2/3 (5 marks)

How did u get in the question it said pi/24 which when put into cos 4\theta gives square root three over 2.

[Mr M]

(Original post by minip12qss)
How did u get in the question it said pi/24 which when put into cos 4\theta gives square root three over 2.

(1 - your answer)/8

[minip12qss]

(Original post by Mr M)
(1 - your answer)/8

So how many marks would i have dropped for leaving it as the square root of three over 2 btw what was the question

[Mr M]

(Original post by minip12qss)
So how many marks would i have dropped for leaving it as the square root of three over 2 btw what was the question

One mark if you are lucky.

[Akash2611]

For the rate of decrease Q7b, would I lose a mark if I wrote -2.73 grams per year?
Thanks!

[TooEasy123]

(Original post by Mr M)
Wow that was convulted! You might be ok as you rejected the invalid solutions in the end.

Yeah I forgot about drawing the graph!

I circled my answer "k=5" if that helps? And I put arrows saying "answer here" lol

[CJAW]

Did question 6i not ask for dx/dy rather than dy/dx?
Secondly, stupidly I forgot to put the dx after some of my integrals. Is this something I'm likely to lose more than one mark for?

[Matt G]

how many marks do you think I will lose if I left the final answer in decimal form, not exact form?

[ALevelGirl]

hi!! thanks for sticking this up Mr M!

For question 3; i think i i had 9x + y - 10 and 2/3 =0 would i still get full marks?

and what was question 8 part iii?

[ALevelGirl]

(Original post by Smiley Face :))
Any one think this exam was harder than june 2011... or about the same?? Let me know please!

i think this one was harder than june 2011 - but maybe thats because i did this one in exam conditions under pressure.

but june 2011 was much harder than other past papers!

[Alex J]

yay i think i might actually have done well somehow

there arent any answers there that seem different from what i put (based upon my vague recollection of how i answered), but there are bound to be a few slips here and there. any idea what the grade boundaries are like in terms of raw marks?

[s04582]

What was question 5(i) again? I cant remember :/
Oh, and also, would I get any marks for getting K=4 on question 8?

[CJAW]

(Original post by s04582)
What was question 5(i) again? I cant remember :/
Oh, and also, would I get any marks for getting K=4 on question 8?

5i) State: ff(26); f^-1(8)

[Mr M]

(Original post by Akash2611)
For the rate of decrease Q7b, would I lose a mark if I wrote -2.73 grams per year?
Thanks!

I thnk that mistake will be condoned.

[Mr M]

(Original post by ALevelGirl)
hi!! thanks for sticking this up Mr M!

For question 3; i think i i had 9x + y - 10 and 2/3 =0 would i still get full marks?

and what was question 8 part iii?

drop 1 mark for 3

8partiii was about finding the greatest and least values of a trigonometric expression