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Math Help - Interquartile range

  1. #1
    Newbie
    Joined
    Apr 2008
    Posts
    1

    Interquartile range

    hello all,
    please help as I'm very stuck!

    I have 50 numbers.
    I need to work out the interquartile range so i need the upper and lower quartiles.

    which numbers do i use? all examples i find seen to be odd in total.

    for the lower quartile i think I need the

    50+1
    -------- = 12.75th number
    4

    and for the upper quartile i think i need the

    3(50+1)
    ----------- = 38.25th no.
    4


    how can i find this or am I going about this all wrong?
    I dont understand how to get the 12.75th or 38.25th number.

    Please help me! thanks a bunch. Will
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  2. #2
    Grand Panjandrum
    Joined
    Nov 2005
    From
    someplace
    Posts
    14,972
    Thanks
    4
    Quote Originally Posted by knottwill View Post
    hello all,
    please help as I'm very stuck!

    I have 50 numbers.
    I need to work out the interquartile range so i need the upper and lower quartiles.

    which numbers do i use? all examples i find seen to be odd in total.

    for the lower quartile i think I need the

    50+1
    -------- = 12.75th number
    4

    and for the upper quartile i think i need the

    3(50+1)
    ----------- = 38.25th no.
    4


    how can i find this or am I going about this all wrong?
    I dont understand how to get the 12.75th or 38.25th number.

    Please help me! thanks a bunch. Will
    An algorithm for doing this can be found here

    RonL
    Follow Math Help Forum on Facebook and Google+

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