Edexcel GCSE Mathematics A Higher Paper 2016 Unofficial Markscheme

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Four things that unis think matter more than league tables 08-12-2016
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    Everything right but
    X=-1.1 and 5.1
    X=-1.7 and 4.7
    Angle MST 69

    100,25,4
    Final questions is (3-root6)/12

    How many marks dropped is that?

    SO happyy!!
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    (Original post by #1Mathlete)
    Probably just 1 for the 100cm"2
    I wrote 100/25 Pie
    Does that count for another mark?
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    what was the answer for the last question and the simultaneous graph questions, please.
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    (Original post by 34908seikj)
    1 I'd say since you got the square correct, but didn't get the circle correct. it wasn't 25, it was 25pi

    then 100-25pi == 4(25-pi)
    I meant that I had 100/25 PIE
    Does that count for another mark or no?
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    For the question on graphs, I put -1.2 and 5.2- will I still get the marks? Is there a range of answers for those?
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    (Original post by jamesM22)
    I meant that I had 100/25 PIE
    Does that count for another mark or no?
    If you had 100/25pi you MIGHT get an extra mark for the 25pi, idk though.
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    The Circle Theorems question is worth 5 Marks if you're wondering
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    (Original post by mysticfalls)
    what was the answer for the last question and the simultaneous graph questions, please.
    For the last question I got (3-root6)/12
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    I put -1.2 and 5.2 for the question with the graph, so is there a range for the correct answer? Or is it only -1.1 and 5.1
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    (Original post by 34908seikj)
    If you had 100/25pi you MIGHT get an extra mark for the 25pi, idk though.
    Ok, do you remember question 12b?
    I had a constructed triangle for my answer
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    (Original post by Mathsgcseexam)
    For the question on graphs, I put -1.2 and 5.2- will I still get the marks? Is there a range of answers for those?
    There will be a given boundary but it wont be very big (maybe 0.2 either side)
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    For that question where it said use the graph to estimate these solutions: for one of them I completed the square and solved them. Would I lose marks? I panicked
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    Can someone explain 17(?)(b) to me? I just put X=2 because I thought it was the vertex of the curve only?
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    (Original post by jamesM22)
    Ok, do you remember question 12b?
    I had a constructed triangle for my answer

    I don't remember having to construct a triangle, just a line perpendicular to AB from point C? is that the question you're talking about?
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    yeah I got that!
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    (Original post by Rajive)
    For that question where it said use the graph to estimate these solutions: for one of them I completed the square and solved them. Would I lose marks? I panicked
    For one of the questions, I stupidly wrote 4.0 instead of 0.04, however I wrote 0.04 in my workings, do you thing they would still mark it correct?
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    What was question 17 and 18?
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    (Original post by student563)
    yeah I got that!
    is it correct?
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    [QUOTE=LogicalFallacy;65190495]Hey, if anybody is willing to contribute the answers, and preferably the questions, then I shall set up a mark scheme for you all. Thanks in advance!

    Can people please attach question numbers to their answers? Method would be appreciated.

    This will be updated as I go along.
    Spoiler:
    Show
    Question 1. What is the volume of the prism? (2 marks)

    Area of face = 30cm²
    Length of prism = 25cm.

    30cm² x 25cm = 750cm³




    Question 2a. Reflect shape in line X = -1 (2 marks)

    Accept correct reflection.

    Question 2b. Rotate shape 90° anticlockwise. (2 marks)

    Accept correct rotation.




    Question 3. What is wrong with the questionnaire? Give two reasons. (2 marks)
    Attachment 538813
    'Too vague (i.e. not 1-2, 3-4 etc.)' and 'no time frame (i.e. not per week, per month, etc.)' are accepted.

    Create a better survey for him to use. (2 marks)

    Why is his maths class not a good sample? (1 mark)

    'Too small' and 'may be biased' are accepted,




    Question 4. Simplify. (all of question 4, 6 marks)
    P2 x P5 = P7

    G6 ÷ G4 = G2

    (K3)2 = K6

    10-5m

    Factorise n2 - 7nn(n-7)




    Question 5. Estimate 892 ÷ 18.9 (2 marks)
    Round to 1 significant figure

    900 ÷ 20 = 45




    Question 6. A teacher is picked at random. 3/5 chance they are female. 36 are males. (3 marks)
    How many teachers are there altogether?

    2/5 of teachers are male. 36 are male.

    2/5 of total = 36
    2 x 18 = 36
    18 x 2 = 90.
    Answer is 90 teachers.




    Question 7(?). Point is the midpoint. Where is the other end?
    Answer is (-3, -2)




    Question 10(?). Can the floor be varnished with 3 tins of 2.5 litre varnish and it is 5 m2 per litre. (5 marks)
    Attachment 538829

    2.5 m x 6 m = 15 m2
    2.5 m x 6 m = 15cm2


    10 m - (2.5 m - 2.5 m) = 5 m
    6 m - 2 m = 4 m

    5 m x 4 m = 20 m2

    15 m2 + 15 m2 + 20 m2 = 50 m2

    5 m2 per litre, 50 m2 ÷ 5 m2 = 10 litres

    2.5 litres per tin, 3 tins, 3 x 2.5 = 7.5 litres.

    Not enough, 7.5 litres is less than 10 litres.

    Answer is 'not enough' with evidence.






    Question 11 (3). What percent of his total spending is his rent now?
    Answer is 36%.


    Question 13(?). How many females visited the art gallery?
    66 students went on the trip.

    Males - Bowling - 4
    Females - Bowling - 6
    Total - Bowling - 10

    Males - Art Gallery - 9
    Females - Art Gallery - 11
    Total - Art Gallery - 20

    Males - Skating - 10
    Females - Skating - 26
    Total - Skating - 36

    Males - Total - 23
    Females - Total - 43
    People - Total - 66


    Answer is 11 females.

    Question 14(?).
    Attachment 538769
    Area of square = 10cm x 10cm = 100 cm²
    Area of circle = π5² = 25π cm²
    Area of shaded = Area of square - Area of circle = 100 cm² - 25π cm² = 100 - 25π cm²


    Question 15(?).

    Compare median, interquartile range and range.


    200 x 25% = 50
    200 - 50 = 150

    Last part, answer was 150.




    Question 16(?). (3.5 x 106) ÷ (5 x 10-3)

    7x108




    Question 17(?).

    x = -0.4 or x = 4.4
    x = -1.1 or x = 5.1
    x = -1.7 or x = 4.7




    Question 18(?).
    7/5

    2 4/5

    4/5




    Question 19(?).
    x < 7




    Question 20(?). Solve X² = 4(X-3)²
    X² = 4[(X - 3)(X - 3)]
    X² = 4[X² - 3X - 3X+ 9]
    X² = 4[X² - 6X + 9]

    X² = 4X² - 24X + 360 = 4X² - X² - 24X + 360 = 3X² - 24X + 360 = 3[X² - 8x + 12]0 = 3[(X - 6)(X - 2)]

    X = 6 or X = +-2




    Question 21(?). What is the chance of the match being cancelled when it does not rain?
    Attachment 538811
    0.8 x 0.05

    Answer is 0.04.


    Question 22(?). What is the angle?

    Angles in a triangle add up to 180°, base angles in an isosceles are equal.
    180° - 48° - 48° = 84°

    Angle at centre is twice angle at circumference.
    84° ÷ 2 = 42°

    Angles in a triangle add up to 180°, base angles in an isosceles are equal.
    (180° - 42°) ÷ 2 = 69°

    Answer is 69°.




    Question 23(?).
    a + b

    -a + 3b

    ¾(a+b)

    Point S is on both lines and is the point at which the lines intersect.




    Question 24(?).
    Table - 100, 25, 4


    Question 25.
    Attachment 538759

    (3-√6) ÷ 12
    question 11 with the 36% was 3 marks
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    What if you only compared the range and median for the box plot question? Can you still get three marks?
 
 
 
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