Practicing Success
Practicing Success
CUET Preparation Today
Let 'y' is a discrete variable taking values $y_1,y_2,y_3 ......y_n$ with probabilities $p_1, p_2, p_3......P_n$ respectively. Then standard deviation of 'y' is given by : |
$E(y^2)-[E(y)]^2$ $\sqrt{E(y^2)-[E(y)]^2}$ $\sqrt{E(y^2)+[E(y)]^2}$ $E(y^2)+[E(y)]^2$ |
$\sqrt{E(y^2)-[E(y)]^2}$ |
The correct answer is option (2) : $\sqrt{E(y^2)-[E(y)]^2}$ |
