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Variance Formula Calculator

Online variance formula: definition Σ(x−x̄)²/n equals the computational Σx²/n−x̄² (population).

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Σx²/n−x̄²
Commas

📖 Tutorial | Variance Formula

1. Definition
Population variance definition Σ(x−x̄)²/n equals the computational Σx²/n−x̄².
2. Formula & Notation
x̄Mean
3. Properties & Laws
  • Equivalent forms;
  • Computational avoids deviations;
  • Population divides n;
  • Non-negative.
4. Steps
  1. Enter data;
  2. Click "Calculate";
  3. Or click "Load Example".
5. Worked Examples
Example: Σx²/n=44,x̄²=36: variance 8.
6. Common Pitfalls
Subtract x̄²;
Divide n;
Non-negative.

❓ FAQ | Variance Formula

Computational?
Σx²/n−x̄².
Benefit?
No deviations.
n or n−1?
Population n.
Non-negative?
Yes.
Example?
8.
Derivation?
Expand squares.