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WebStatistics: Alternate variance formulas. Sal explains a different variance formula and why it works! For a population, the variance is calculated as σ² = ( Σ (x-μ)² ) / N. Another equivalent formula is σ² = ( (Σ x²) / N ) - μ². If we need to calculate variance by hand, this alternate formula is easier to work with. WebSigma (Sum) Calculator Expanded form calculator shows expanded forms of a number including expanded notation form, expanded factor form, expanded exponential form and word form. Get calculation support online WebSigma notation expanded form calculator - Example: n^2 This symbol (called Sigma) means sum up It is used like this: Sigma is fun to use, and can do many clever Summation … co state trooper