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Mr M's OCR (not OCR MEI) Core 2 Answers May 2012 <strong><font

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    Mr M for 7ii I got positive the answer you put not negative
    How many marks would I lose?
    And for 5b I misread the first 9 for 19 :facepalm2: but did the rest ok how many marks would I lose there?
    Thanks
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    (Original post by Mr M)
    none
    yay!!!
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    (Original post by Mr M)
    [B][U]]ks)
    hey how much do you think will be lost for Q4, i found 2 extra values... including the ones you've given, i hope it's just one..

    also for 7B, i found 3 root 3 over 8, however i put this value into Siny to get 40 degrees something, would i still get all the marks.. ?

    Thanks so much for the answers btw, really appreciate it.
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    (Original post by matty b)
    what are the marks for on q's 9aii, 9bii , 8ii and 7aii? i know there's an answer mark, but what about the method marks?
    the mark scheme hasn't been finalised yet so no-one knows
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    (Original post by IShouldBeRevising_)
    Hey do you remember what the last question was by any chance, I mean the last part of the last question one that was worth 5 marks.
    the questions are here

    http://www.thestudentroom.co.uk/show...003552&page=18
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    (Original post by AKayaker)
    Hi Mr M
    For the alpha beta question there was a cheat method on the calculator
    For the alpha if you did (cos(tan-1(0.4)))^2 the calculator gave you 25/29 so you could just write down the answer as sqrt(25/29)
    the same thing also worked for the beta question
    This method meant I had hardly any workings, will I get all the marks for the answer, also will I lose marks as I think i forgot to change both down to surds (I left them as 5/sqrt(29) and -sqrt(40)/7 ) as it didn't say in the question it had to be simplified and I stupidly forgot
    They are exact values so should be fine.
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    Messed up a bit, probably got somewhere in the high 50s, but could have done with high 60s really.
    How come you couldn't have 270 for question 4?
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    (Original post by jodiedoodles)
    pretty sure a was log (base 2) 27, r was log (base 2) y

    It was definately those two, just can't quite remember which was around!
    Yeah it was them thanks
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    (Original post by JessLamb)
    why are these correct? i'm confused how you got those answers?
    Q4) solve 4cos^2+7sinx-7=0, between 0 and 360

    4(1 - (sinx)^2 ) + 7sinx - 7

    = - 4sinx^2 + 7sinx - 3 = 0

    4sinx^2 - 7sinx + 3 = 0

    (4sinx - 3) (sinx - 1) = 0

    therefore sinx = 3/4 and 1

    sin^-1(3/4) = 48.6 and (180 - 48.6)

    sin^-1(1) = 90

    therefore, x = 48.6, 90 and 131.4
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    (Original post by jodiedoodles)
    Mr M , for the last question I must have done something stupid somewhere as I worked out y = 6, and substituting this back in got -3 (we wanted 3) . I think I've just messed my signs up somewhere, but I'm pretty sure I done the same working as my friend who got the correct answer as 2/3 (I think?)

    Would I still gain method marks, and lose the answer mark? How many marks do you estimate I would lose here?

    Thanks!
    Lose no more than 2 marks.
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    (Original post by Mr M)
    They are exact values so should be fine.
    Mr m I did not write 15 (CM) for the radius question I just wrote 15 will I still get the marks
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    (Original post by sj_1995)
    If, foolishly, I did (3+2x)^5 - (3-2x)^5 instead of plus, would I get any marks? Im sure i read somewhere in an Old OCR mark scheme there was a mark for correct working put incorrect question copying!

    Or am I dreaming....

    Other than that really happy with the paper!
    Just lose one mark if you did your calculation correctly.
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    Hi Mr M,

    For question 4, I used the right trig identities and got to 4sin^2x - 7sinx + 3 = 0 (not sure if I've remembered it correctly) but then I must've stupidly factorised it wrong and ended up with x= 30, 150.

    Do you think I'd get any of the 6 marks, seeing as my method was correct(ish)?

    Thankyou!
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    (Original post by halii_94)
    Mr M for 7ii I got positive the answer you put not negative
    How many marks would I lose?
    And for 5b I misread the first 9 for 19 :facepalm2: but did the rest ok how many marks would I lose there?
    Thanks
    Lose 1 mark

    Lose only 1 mark if you are lucky
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    (Original post by Mr M)
    Lose no more than 2 marks.
    Thanks! Sorry to be a pain but do you have any idea how many raw marks around 75-80 UMS would need?
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    (Original post by peachesandcream77)
    hey how much do you think will be lost for Q4, i found 2 extra values... including the ones you've given, i hope it's just one..

    also for 7B, i found 3 root 3 over 8, however i put this value into Siny to get 40 degrees something, would i still get all the marks.. ?

    Thanks so much for the answers btw, really appreciate it.
    Just lose 1 mark and then get full marks
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    Hello Mr M,
    If I wrote 2sqrt10/7 for 7(ii), how many marks will I lost?
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    On the last question I got y to equal -1 would I get any method marks or none at all?

    This was posted from The Student Room's Android App on my HTC One X
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    (Original post by Ursin)
    Messed up a bit, probably got somewhere in the high 50s, but could have done with high 60s really.
    How come you couldn't have 270 for question 4?
    It isn't a solution - I don't know where your 270 came from?
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    (Original post by IShouldBeRevising_)
    Mr m I did not write 15 (CM) for the radius question I just wrote 15 will I still get the marks
    The answer is 15. That's correct.

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Updated: May 25, 2012
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