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

  • Thread starter smaan
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Homework Statement



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.


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  • #2
SteamKing
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What did you try to get Sum(x)? Sum(x^2)?
 
  • #3
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What did you try to get Sum(x)? Sum(x^2)?
I tried squaring x, but obviously that is not correct.
 
  • #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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