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Upper Quartile

  1. May 25, 2010 #1
    Normally this is a very easy task, but i just can't get this one right.

    the data set is 14
    14
    14
    15
    15
    15
    15
    15
    15
    16
    16
    16
    16
    16
    16
    17
    17
    17
    18
    25

    And i get Q1 and Q2 right at 15 and 16, but i keep getting the upper quartile as 17, when it is meant to be 16.5. Can anyone help me as to how to get this answer?

    Thanks
     
  2. jcsd
  3. May 25, 2010 #2

    mathman

    User Avatar
    Science Advisor

    You have 20 items. The upper quartile is between the fifth and sixth item counting from the top. These are 17 and 16 respectively.
     
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