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Math Help - inter quartile range help!!!

  1. #1
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    inter quartile range help!!!

    Im either wrong or my textbook is wrong, the former being the most likely!

    1 2 4 5 6 7 8 8 10 13 15

    interquartile range...

    I did got the lower quartile as the 3rd value and the upper as the 9th, ie 4 and 10...

    so interquartile range = upper - lower...right?

    so 10 - 4 = 6

    im a right, text book says (9-6) = 3?
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  2. #2
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    Quote Originally Posted by bobchiba View Post
    Im either wrong or my textbook is wrong, the former being the most likely!

    1 2 4 5 6 7 8 8 10 13 15

    interquartile range...

    I did got the lower quartile as the 3rd value and the upper as the 9th, ie 4 and 10...

    so interquartile range = upper - lower...right?

    so 10 - 4 = 6

    im a right, text book says (9-6) = 3?
    You are right!
    Good job
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  3. #3
    Grand Panjandrum
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    Quote Originally Posted by bobchiba View Post
    Im either wrong or my textbook is wrong, the former being the most likely!

    1 2 4 5 6 7 8 8 10 13 15

    interquartile range...

    I did got the lower quartile as the 3rd value and the upper as the 9th, ie 4 and 10...

    so interquartile range = upper - lower...right?

    so 10 - 4 = 6

    im a right, text book says (9-6) = 3?
    Yes, this is almost identical to the first example given here.

    Also whatever plausible alternative definition of quartile you use 6 cannot be
    the first quartile, so there is no way that the books result can be right.

    RonL
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