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

    2
    ReputationRep:
    this question is really ****ing pissing me off, I just cant do it. edexcel ****ers decide to mind**** students with this question

    https://1a388b28f5ce9318f837a64962fc...%20Edexcel.pdf

    question 5
    Offline

    2
    ReputationRep:
    Draw your Venn diagram. Put in the information you know and then work from there using your knowledge of how Venn diagrams work applied to the information you're given.

    Don't be put of that this has 3 circles... Often these questions are made easier because students over-react to them...
    • Thread Starter
    Offline

    2
    ReputationRep:
    (Original post by JLegion)
    Draw your Venn diagram. Put in the information you know and then work from there using your knowledge of how Venn diagrams work applied to the information you're given.

    Don't be put of that this has 3 circles... Often these questions are made easier because students over-react to them...
    I have tried it already, and i still cant do it. The entire paper is so hard. Question 7 is also another one which I cannot do
    Offline

    2
    ReputationRep:
    Could you post your working so far so we can see where you're going wrong?

    Also, do you remember how to apply information into Venn diagrams? If not, I'd recommend going over that chapter again - practice a few of the review exercise questions too, because they are about as hard as it'll get.

    For question 7, what parts are you having trouble with?
    • Thread Starter
    Offline

    2
    ReputationRep:
    (Original post by JLegion)
    Could you post your working so far so we can see where you're going wrong?

    Also, do you remember how to apply information into Venn diagrams? If not, I'd recommend going over that chapter again - practice a few of the review exercise questions too, because they are about as hard as it'll get.

    For question 7, what parts are you having trouble with?
    for question 7, the first part. The mark scheme shows that you have to multiply the probablities which suggest its independent? but I dont seee why
    Offline

    8
    ReputationRep:
    (Original post by imran_)
    for question 7, the first part. The mark scheme shows that you have to multiply the probablities which suggest its independent? but I dont seee why
    Hmm.. Not sure why the MS states that (I'll look into to it later).

    What I thought the solution is is this:

    P(M|L) = P(M and L)/P(L) = 0.2/0.3 = 2/3

    EDIT: Welp. Looks like I'm wrong (checked the MS)...

    EDIT 2: P(M and L) doesn't equal 0.2 as 0.2 refers to the prob of a male being left handed (and not the overall prob of a male being chosen who is left handed). Really struggling to grasp the use of the independence law though...
    Offline

    1
    ReputationRep:
    You can tackle this easier with a tree diagram in my honest opinion.

    First branch is male (3/5) and female (2/5).

    The second branch is left or right. From the male one it will be L (1/5) and R (4/5)

    And from the female one is unknown. Maybe call the left branch x. Use your multiplying rules and the information the question tells you (3/10) left handed to find x.
    • Thread Starter
    Offline

    2
    ReputationRep:
    (Original post by plaguarist)
    You can tackle this easier with a tree diagram in my honest opinion.

    First branch is male (3/5) and female (2/5).

    The second branch is left or right. From the male one it will be L (1/5) and R (4/5)

    And from the female one is unknown. Maybe call the left branch x. Use your multiplying rules and the information the question tells you (3/10) left handed to find x.
    would u mind showing a worked solution please
 
 
 
  • 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
    Brussels sprouts
    Useful resources

    Make your revision easier

    Maths

    Maths Forum posting guidelines

    Not sure where to post? Read the updated guidelines here

    Equations

    How to use LaTex

    Writing equations the easy way

    Student revising

    Study habits of A* students

    Top tips from students who have already aced their exams

    Study Planner

    Create your own Study Planner

    Never miss a deadline again

    Polling station sign

    Thinking about a maths degree?

    Chat with other maths applicants

    Can you help? Study help unanswered threads

    Groups associated with this forum:

    View associated groups
  • 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.