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Calculators›Probability theory›Variance
Probability theory

Variance

Variance, standard deviation and distribution properties.

Probability theory

Variance of two outcomes

Var[X]=p(1−p)(x₁−x₂)²→Probability theory

Variance of three outcomes

Var[X]=E[X²]−E[X]²→Probability theory

Binomial variance

Var[X]=np(1−p)→Probability theory

Poisson variance

Var[X]=λ→Probability theory

Standard deviation from variance

σ=√Var[X]→