Deviation from the Mean · Variance
Lesson 2
Variance of a random variable \(\alpha\) is defined as its mean squared deviation from its expected value: \[\operatorname{Var}[\alpha]=\operatorname{E}[(\alpha - \operatorname{E}[\alpha])^{2}].\]
Deviation from the Mean · Variance
Variance of a random variable \(\alpha\) is defined as its mean squared deviation from its expected value: \[\operatorname{Var}[\alpha]=\operatorname{E}[(\alpha - \operatorname{E}[\alpha])^{2}].\]