OCR Maths C3 June 2019 (Old Spec resit only) Unofficial Markscheme Watch

AngyBoi
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Unofficial mark scheme for the OCR Legacy spec Core 3 exam on Tuesday 18th June 2019
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AngyBoi
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What did everyone get for that 11 mark question 9?
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tanksky
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how did u find it
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AngyBoi
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It was alright but slightly harder than I expected it to be, how about you?
(Original post by tanksky)
how did u find it
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Bottom101
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Does anyone remember the question where you had to find values for sin^2(A) and sin^2(B). Or their answers?
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yousman3357
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0.55 and 0.2 ?
(Original post by Bottom101)
Does anyone remember the question where you had to find values for sin^2(A) and sin^2(B). Or their answers?
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Bottom101
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Cheers. Do you remember how many marks it was?
(Original post by yousman3357)
0.55 and 0.2 ?
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yousman3357
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4

What did you get as answer ?
(Original post by Bottom101)
Cheers. Do you remember how many marks it was?
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Bottom101
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I got 81/140 and something
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Iota14
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From what I can remember this is what i got (numbers may be slightly off and so might the question order)
1. Second derivative - 2/7

2. Modulus
(i) 2/3, and something else
(ii) With Trig sec1/2y - 3.54

3. Area of PQ = e-3

4. Functions equations:
(i) f(x) a= 4 b=-7
(ii) ggg(x) p= -1/5 q=20

5. Rate of change? Something like 6.81/y x 0.16 = 0.51

6. Gradient at A? and iterations? Cant remember

7. 2+3Cos -1 (x) ?
(i) Translation 2 in x, stretch 3 in y
(ii) Range: 2<y<3pi +2

8. Trig : A= 1/5 B=11/20

9. Find A and area of RA= 3.5, Area = 6root5
Last edited by Iota14; 4 weeks ago
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Solle
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Oh damn I didn’t realise for last part area of RA was part of the question, how many marks do you reckon that was ?
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Iota14
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Min 3 Max 5 id say
(Original post by Solle)
Oh damn I didn’t realise for last part area of RA was part of the question, how many marks do you reckon that was ?
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stu.dyates
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(Original post by Iota14)
From what I can remember this is what i got (numbers may be slightly off and so might the question order)
1. Second derivative - 2/7

2. Modulus
(i) 2/3, and something else
(ii) With Trig sec1/2y - 3.54

3. Area of PQ = e-3

4. Functions equations:
(i) f(x) a= 4 b=-7
(ii) ggg(x) p= -1/5 q=20

5. Rate of change? Something like 6.81/y x 0.16 = 0.51

6. Gradient at A? and iterations? Cant remember

7. 2+3Cos -1 (x) ?
(i) Translation 2 in x, stretch 3 in y
(ii) Range: 2<y<3pi +2

8. Trig : A= 1/5 B=11/20

9. Find A and area of RA= 3.5, Area = 6root5
I got the same for the 11 mark question!
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yousman3357
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Anyone for a C4 exchange ?
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Iota14
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what about the rest of it? similar stuff?
(Original post by stu.dyates)
I got the same for the 11 mark question!
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Iota14
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What did you get for the last question? I got 1.34
(Original post by yousman3357)
Anyone for a C4 exchange ?
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Iota14
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Heres how I have c4, cant remember much:
1. Partial fraction cant remember
2. Vector : (006) parallel to z
3. cant remember
4. Show integral is ln4
5. Binomial expansion : 1 +5x -50x^2 +750x^3. mod x< 1/25 543/500
6. Integration: something complicated like u^-6 and u^8 with some constants infront
7. curve defined implicity, y=-1/2 and therefore x and y have no solutions since 1/0
8.Parametic stat points were 0,-1 and -4,3 i think
9. Vectors. Think i got the last part wrong - i got 8root133 i think?
9. ln(a/5-a) = e^kt - ln24 i think. and final part i got 1.34
Last edited by Iota14; 4 weeks ago
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yousman3357
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I got 1.34....... it was a long decimal
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AngyBoi
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#19
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For the partial fractions, I think they were -2 5 and 4
I got (006) for the vector
Area of triangle got on hundred and something
For integration by substitution -1/(2x-5)^6 -5/(2x-5)^7 something like that
Parametric I agree (0,-1) (-4,3) I think
I also agree with the final question although I got 1.2 something so I probably had a rounding error (Didn't seem right for area of a forest :/)
(Original post by Iota14)
Heres how I have c4, cant remember much:
1. Partial fraction cant remember
2. Vector : (006) parallel to z
3. cant remember
4. Show integral is ln4
5. Binomial expansion : 1 +5x -50x^2 +750x^3. mod x< 1/25 543/500
6. Integration: something complicated like u^-6 and u^8 with some constants infront
7. curve defined implicity, y=-1/2 and therefore x and y have no solutions since 1/0
8. Parametic stat points were 0,-1 and -4,3 i think
9. ln(a/5-a) = e^kt - ln24 i think. and final part i got 1.34
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Iota14
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yeah i rounded to 1.34 (3sf) . nice . what did you get for the last part of 9?
(Original post by yousman3357)
I got 1.34....... it was a long decimal
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