Hey there! Sign in to join this conversationNew here? Join for free
    Offline

    0
    ReputationRep:
    (Original post by 11tan)
    For the very first question is it acceptable to leave it as 9/20 as it is a probability?
    yh
    Offline

    1
    ReputationRep:
    What did people get for the triangle perimeter question
    Offline

    0
    ReputationRep:
    (Original post by 11tan)
    Yeah you'll definitely get some method marks for a correct substitution
    I got question 3 (probablity )wrong but i mentioned that probabilities always add up to 1? Would that be a mark or too basic?
    Offline

    9
    ReputationRep:
    (Original post by abbigm1)
    This is true but a fraction is correct too because when we are given probability questions with tree diagrams they are usually in the form of fractions
    It is ok to use a fraction during the process of working out a question (tree diagrams for example) , but the final answer MUST be given as a decimal or percentage!


    Posted from TSR Mobile
    Offline

    1
    ReputationRep:
    (Original post by GCSE DEMOLISHER)
    The last question was 100% 80.4 degrees. You had to re-arrange half absinC to get 18cm2 divided by half x 7 x 8. With the number you get, use inverse sine. This gives you the angle between the 2 lengths. As you have an angle between 2 lengths, you can use cosine rule to find the final length. The length squared = 7^2 + 8^2 - 2 x 7 x 8 x cos (the angle got from before). Square root this answer to give you the final length of the triangle. Once you have all 3 lengths, you can then re-arrange the cosine rule to find the final angle (not given on the formula sheet). Do 7^2 + (length acquired just now)^2 - 8^2 divided by 2 x 7 x (length acquired just now) gives you cos of the angle they asked you to find. Do inverse cos on this number and you get 80.4 which looked very similar to the angle given. Who else did this for the last question?
    Yep I did that
    Offline

    1
    ReputationRep:
    Only question i got wrong was question 24 part A and B hopefully i get an A
    Offline

    0
    ReputationRep:
    (Original post by A24_)
    I got 10 for the stratified sampling?? You can't get 10.85778 people so I rounded down but this is probs not in the markscheme


    Posted from TSR Mobile
    You're meant to round it up I think
    Offline

    0
    ReputationRep:
    Thanks but where's the marks for each answer 🤔 how would I know how many marks I've missed out if I don't know the full marks for each question?
    Offline

    2
    ReputationRep:
    (Original post by jtb135)
    Wait a sec, x^3 - 5x = 34

    3.7^3 - 5(3.7) = 32.153
    34 - 32.153 = 1.847
    So 3.7 is 1.847 away.

    3.8^3 - 5(3.8) = 35.872
    35.872 - 34 = 1.872
    So 3.8 is 1.872 away.

    This shows 3.8 being 0.025 further away than 3.7. 3.7 is closer. These are cubed numbers so even though you could round up from 3.75, the number gap changes as the numbers get bigger, so you count just assume to round up. They only care about 1d.p. numbers, using 3.75 doesnt matter. You have to find which 1d.p. is closer, and its 3.7.
    3.7 is too small
    3.8 is too large
    3.75 is too small (about 3.98)

    So 3.75<x<3.8
    So to 1dp x=3.8
    Offline

    0
    ReputationRep:
    It's because you worked out the wrong angle, you needed to use that angle to work out another side and then you could work out the angle x
    Offline

    1
    ReputationRep:
    (Original post by ElliottR)
    The answer was 80.4. You would get 80.1 if you rounded the answers mid way through the question not only at the end.
    Exactly. You shouldnt round during working out answers. Multiple times on past papers, even rounding to 3d.p. can change you're answer significantly, especially when working with sine/cosine rules
    Offline

    1
    ReputationRep:
    (Original post by A24_)
    I got 10 for the stratified sampling?? You can't get 10.85778 people so I rounded down but this is probs not in the markscheme


    Posted from TSR Mobile
    Answer was 11.. You round up not down
    Offline

    2
    ReputationRep:
    (Original post by Purpleunicorn197)
    Hi I'm going to start and unofficial markscheme so add your answers
    Reps are not necessary but would be appreciated

    It would be really useful if you could remember the question numbers
    1. Order numbers correctly and include a key
    b) 9/20=
    0.45
    2a. 5a*2b*3c =
    30abc
    b. Factorise fully 3y +6 =
    3(y+2)
    c. Expand x(x-3)=
    x^2-3x
    3.
    x=9.25
    4. Smallest packet was best value for money because it was cheapest per bag of crisps
    5. 4 times as many red than green: There were 0.4 blue and 0.15 yellow.
    0.4+0.15+4x+x=1
    0.55+5x=1
    5x=0.45
    x=0.09
    4x=0.36
    Green- 0.09 Red- 0.36
    6a. 20.3
    b. 68.04kg
    c. 2.61m
    7. 3.8
    8a. 4:3
    b. 480 pixels
    9.x= 124 degrees
    10. 7.92
    11.£42.29
    12. x=144 degrees
    13.
    -2 -1 0 1 2
    -1 3 1 -1 3
    Draw curve
    14. 3 Bars
    15. No, because 7766.22 was greater than 7500 pounds
    16. 128g
    b.11g
    17. 30.1
    18. 10a^5b^4
    b. y= 5p^2-x
    19.11 males
    20. x= 0.29 or x= -2.29
    21. 29.25
    22. F.d- 1.6, 3.2, 2.4, 1.8, 0.3
    23.28.9
    24a. -1/3x+4
    b. 2x/(x+1)(x-1)
    25. 80.4
    Can you show how many marks each question was out of?
    Offline

    9
    ReputationRep:
    (Original post by A24_)
    I got 10 for the stratified sampling?? You can't get 10.85778 people so I rounded down but this is probs not in the markscheme


    Posted from TSR Mobile

    You still round up with stratified sampling. They were taking a sample of 50. You could take the time to work out the different year groups and genders and using 11 would add up to 50. There would be another group that would have like 8.32.. Something and it would round down to 8 so it would balance out the fact you rounded up for 10.85778. Hope this helps.


    Posted from TSR Mobile
    Offline

    0
    ReputationRep:
    (Original post by FreakinYAY)
    F*ck yeah got 80.1 without having a clue on what tf i was doing
    pretty sure it was 80.4......
    Offline

    4
    ReputationRep:
    i got 80.4, most of my friends did too
    Online

    8
    ReputationRep:
    (Original post by Katlin Rose)
    No, you would not get the marks sorry. I remember the table being very specific :/
    Which one was on the left and what was the answer?
    Offline

    1
    ReputationRep:
    (Original post by Disfuligee)
    3.7 is too small
    3.8 is too large
    3.75 is too small (about 3.98)

    So 3.75<x<3.8
    So to 1dp x=3.8
    Ignore 3.75, you're only looking at 1 d.p. The 3.75 thing is misleading, Because 3.8 is still further away than 3.7
    Offline

    1
    ReputationRep:
    Would I still get full marks for rounding down to 68 question 6b?
    Offline

    1
    ReputationRep:
    Does any one know the amount of marks for each question?
 
 
 
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • Poll
    Have you ever participated in a Secret Santa?
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

    Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

    Quick reply
    Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.