What differentiates the two formulas, from , and why the difference?

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What differentiates the two formulas,

from , and why the difference?

 

 

  • 11 years ago
What differentiates the two formulas, 1/(n-1) Σ (x – xbar)^2from 1/n Σ (x – µ)^2, and why the difference?
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