Question

What is the variance of the discrete random variable?

Answer 1

$\text{variance of the discrete random variable the difference between}\newline \text{ the values of a random variable and its mathematical expectation}\newline Var(X)=\sum_{i=1}^{n}{x_i^2 \cdot p_i}-\left(\sum_{i=1}^{n}{x_i \cdot p_i} \right)^2$