Mr M's OCR (not OCR MEI) Core 2 Answers May 2016 Watch

Mr M
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#121
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#121
(Original post by Bruce267099)
For last question i got pi/3a and (pi + pi/3a), How many marks will get?
Drop 1.
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Mr M
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#122
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#122
(Original post by MathsORC)
What was question 8(v)?

Thanks for the mark scheme
Trapezium rule with 2 strips to find \int_1^4 3^{x-2} \, dx
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Mr M
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#123
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#123
(Original post by luztospooge)
For 9iii I misread the q and used my value for a from the previous question but got the right solutions just with my a subbed in. How many do you think that would lose?
You might get 2 for using tan and solving your equation.
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Mr M
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#124
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#124
(Original post by black1blade)
On 4 ii, would I loose a mark for saying x=-3?
Drop 1.
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Mr M
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#125
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#125
(Original post by groceryboi)
What was the equation of x^4 graph on question 7?
y=x^4-4x^3-2x^2+12x+9
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Annonomous09
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#126
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#126
Hi Mr M, thank you for all these answers, it really helps a lot.

Which question is it that the answer is k=1/9 for? I can't find it in the answers you provided but I keep seeing people saying that they got that as an answer.
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JamesK3000
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#127
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#127
If I used my answer for a from part ii in part iii but did the question with the correct method, how many marks would I get?
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Kantth
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#128
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#128
On 6(iii) i got the formulas right and subbed the values in correct but in the next step i didnt times everything by 2 (as its 1/2N in the formula) but everything else i did right and ended up getting N>25.6 so got N=26
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L0gical_2
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#129
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#129
On 9)iii) I forgot to divide by a. I got 1/3 pi and 4/3 pi. How many marks will I lose/get


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Hdhdn
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#130
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#130
On the integration question I forgot to write the +4 how many marks will I lose
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Csd1999
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#131
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#131
(Original post by Mr M)
Probably drop 2 marks in total.
That would be lovely, I thought I'd drop 4 easily! Thanks.
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Bruce267099
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#132
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#132
(Original post by Mr M)
Drop 1.
Thank you!!!

Also on the final part of the sequences question where we had to work out N;

I got up to N/2(10 + (N-1)1.5) - 1200 > 0
Got 1.5N^2 - 8.5N + 1200 = 0
How many marks will i get, if any?
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Saching99
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#133
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#133
Gave 7iv as a decimal to 3 or 4 sig fig , it didnt say anytbing about it having to be a fraction right ?
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Mr M
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#134
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#134
(Original post by Annonomous09)
Hi Mr M, thank you for all these answers, it really helps a lot.

Which question is it that the answer is k=1/9 for? I can't find it in the answers you provided but I keep seeing people saying that they got that as an answer.
It isn't a correct answer. There is a scale factor of 1/9 in 8ii.
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Mr M
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#135
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#135
(Original post by Saching99)
Gave 7iv as a decimal to 3 or 4 sig fig , it didnt say anytbing about it having to be a fraction right ?
Drop 1. It said you had to give the exact area. In fact, you'll drop all the marks if you just typed that integral into your calculator and didn't show any working.
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Mr M
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#136
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(Original post by Bruce267099)
Thank you!!!

Also on the final part of the sequences question where we had to work out N;

I got up to N/2(10 + (N-1)1.5) - 1200 > 0
Got 1.5N^2 - 8.5N + 1200 = 0
How many marks will i get, if any?
You quadratic is wrong but your method is ok. Get 3 marks I expect.
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CloudPotter98
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#137
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#137
how many marks did you need for full UMS last year?
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JamesK3000
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#138
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#138
(Original post by CloudPotter98)
how many marks did you need for full UMS last year?
69/72 I think
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Hakak#12
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#139
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For the question to work out N, I got the right quadratic but my calculator gave me a wrong value so I wrote N=39 how many marks do I loose?
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Mr M
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#140
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#140
(Original post by Hakak#12)
For the question to work out N, I got the right quadratic but my calculator gave me a wrong value so I wrote N=39 how many marks do I loose?
Probably just 1.
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