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

S3 Edexcel Central Limit Theorem Exercise 3D question 11 Watch

    Offline

    19
    ReputationRep:
    (Original post by Nikhilm)
    From the attachment, P(X < 110) = 0.9. I will call this value x

    and P(X > 110) = 0.1. I will call this value y.

    Hence, x = 1-y , i.e. P(X < 110) = 1 - P(X > 110)

    Same thing I did for my answer no?
    definitely not !!
    there reason I did so is because the probability is less than 0.5, no tables for that
    look at another example where the probability is over 0.5 like in your example
    • Thread Starter
    Offline

    3
    ReputationRep:
    (Original post by TeeEm)
    definitely not !!
    there reason I did so is because the probability is less than 0.5, no tables for that
    look at another example where the probability is over 0.5 like in your example
    OMG I'm such an idiot!!!


    Posted from TSR Mobile
    • Thread Starter
    Offline

    3
    ReputationRep:
    (Original post by TeeEm)
    definitely not !!
    there reason I did so is because the probability is less than 0.5, no tables for that
    look at another example where the probability is over 0.5 like in your example
    Thank you so much, will rep when I'm on my computer!


    Posted from TSR Mobile
    Offline

    19
    ReputationRep:
    (Original post by Nikhilm)
    Thank you so much, will rep when I'm on my computer!


    Posted from TSR Mobile
    all the best !!
 
 
 
  • 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
    Brexit voters: Do you stand by your vote?
    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

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