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Stats: Need help understanding where the sum of x^2 comes from

  1. Sep 17, 2013 #1
    1. The problem statement, all variables and given/known data

    I have no idea where the sum of x^2 comes from, from the information I posted. I know it must be something pretty simple but its completely going over my head. In the picture that I've attached, I am wondering where the 2431.72, 4901.66, and 3252.44 come from. Thank you for any help.


    2. Relevant equations



    3. The attempt at a solution
     

    Attached Files:

  2. jcsd
  3. Sep 17, 2013 #2

    SteamKing

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    What did you try to get Sum(x)? Sum(x^2)?
     
  4. Sep 17, 2013 #3
    I tried squaring x, but obviously that is not correct.
     
  5. Sep 17, 2013 #4

    SteamKing

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    Did you try, you know, adding up the columns of figures? That's what Sum(x) means. The other one is trickier: you've got to square each number, and then add them up.
     
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