Mathematics · essential
Variance of a discrete random variable for JEE
Baye's theorem, probability distribution of a random variable
Formula
\(\operatorname{Var}(X)=\sigma^2=E\big[(X-\mu)^2\big]=\sum_x (x-\mu)^2p(x)\)
Variables: \(\mu=E(X)\), \(p(x)=P(X=x)\).
Dispersion of probability distribution.