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Math Help - Constructing a frequency distribution. Where's my mistake?

  1. #1
    Newbie
    Joined
    Jun 2008
    Posts
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    Constructing a frequency distribution. Where's my mistake?

    Okay, so I have to construct a frequency distribution. My highest value is 25.3 and my lowest is 20.5. I have no idea what number of classes I want to pick and when I keep doing this it's not coming out right.

    For example I did this : 25.3- 20.5/8 = .6

    And this is what I got :

    20.5- 21
    21.5- 21.6
    21.7- 22.2
    22.3- 22.8
    22.9- 23.4
    23.5- 24
    24.1- 24.6
    24.7- 25.2

    But 25.3 isn't included?! What did I do wrong? Please help?
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  2. #2
    Super Member
    Joined
    Jan 2009
    Posts
    591
    Quote Originally Posted by gnarlycarly227 View Post
    Okay, so I have to construct a frequency distribution. My highest value is 25.3 and my lowest is 20.5. I have no idea what number of classes I want to pick and when I keep doing this it's not coming out right.
    For example I did this : 25.3- 20.5/8 = .6
    And this is what I got :
    20.5- 21
    21.5- 21.6
    21.7- 22.2
    22.3- 22.8
    22.9- 23.4
    23.5- 24
    24.1- 24.6
    24.7- 25.2
    But 25.3 isn't included?! What did I do wrong? Please help?
    \dfrac{ 25.3- 20.5}{8} = .6

    0--> 20.5
    +0.6
    1--> 21.1
    +0.6
    2--> 21.7
    +0.6
    3--> 22.3
    +0.6
    4--> 22.9
    +0.6
    5--> 23.5
    +0.6
    6--> 24.1
    +0.6
    7--> 24.7
    +0.6
    8--> 25.3


    Your groupings should be more like this:
    20.5 - 21.1
    21.1 - 21.7
    21.7 - 22.3
    22.3 - 22.9
    22.9 - 23.5
    23.5 - 24.1
    24.1 - 24.7
    24.7 - 25.3
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