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

Stats help - can you work out decile or percentile with this info? Watch

    • Thread Starter
    Offline

    13
    ReputationRep:
    I haven't done any maths for a few years but I was wondering if you can work out the decile/percentile of a particular number if I had the mean and standard deviation but not the individual numbers? I can probably have the n value too if needed and it's normal distribution.

    Thanks
    Offline

    1
    ReputationRep:
    if the underlying population is normal ( this has to be true or the following is false), by working out how many standard deviations the number is away from the mean and then using that value to find percentile with standard tables. Eg if mean = 10 sd =2 and number is 13 that's 1.5 standard deviations from the mean which if you compare with standard tables (http://www.mei.org.uk/files/pdf/formula_book_mf2.pdf) will give you a percentile value of around 93
 
 
 
  • 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
    Has a teacher ever helped you cheat?
    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.