Statistics Formula Sheet. The important statistics formulas are listed in the chart below: Mean. x ¯ = ∑ x n. x = Observations given. n = Total number of observations. Median. If n is odd, then. M =.
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σ = v a r i a n c e = ∑ ( x i − x ¯) 2 N These are the basic formulas used in Statistics for various purposes. To know more about advanced formulas, focus on learning these basic ones first