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I am not able to understand where sum(sq(x-(mean of x))) come from. and why square why not power 4.

Rajan
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    Suggested reading: http://math.stackexchange.com/questions/5392/intuitive-explanation-of-variance-and-moment-in-probability and http://math.stackexchange.com/questions/31126/usefulness-of-variance – JMoravitz Apr 08 '16 at 18:25
  • Thanks, I will take a look – Rajan Apr 08 '16 at 18:27

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