1 votes 1 votes If $E$ denotes expectation, the variance of a random variable $X$ is given by $E\left[X^2\right]-E^2[X]$ $E\left[X^2\right]+E^2[X]$ $E\left[X^2\right]$ $E^2[X]$ Others gate2007-ec + – admin asked Sep 19, 2022 edited Feb 24, 2023 by Lakshman Bhaiya admin 46.4k points 97 views answer comment Share Follow See all 0 reply Please log in or register to add a comment.