For the random variable X, if V ( X )=4, E ( X )=3, then E ( x ^2… - Vidyadip

MCQ

For the random variable $X$, if $V ( X )=4, E ( X )=3$, then $E \left( x ^2\right)$ is ____

A
9
✓
13
C
12
D
7

✓

Answer

Correct option: B.

13

13

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "MCQ" from Question Bank [2022]→Question Bank [2022] — all question types→Maths STD 12 Science question papers→Maharashtra Board STD 12 Science question papers→Maharashtra Board question paper generator→

Similar questions

$\int_0^x \frac{x \tan x}{\sec x+\tan x} d x=$

$\text{f}(\text{x})=1+2\sin\text{x}+3\cos^{2}\text{x}, 0<\text{x}<\frac{2\pi}{3}$ is :

The area of the region included between the parabolas $y^2=4 a x$ and $x^2=4 a y,(a>0)$ is

given by

If $\text{x}=\text{t}^2,\text{y}=\text{t}^3$ Then $\frac{\text{d}^2\text{y}}{\text{dx}^2}=$

If the position vectors of the points $A , B , C , D$ be $2 \hat{i}+3 \hat{j}+5 \hat{k}, \hat{i}+2 \hat{j}+3 \hat{k},-5 \hat{i}+4 \hat{j}-2 \hat{k}$ and $\hat{ i }+10 \hat{ j }+10 \hat{ k }$ respectively, then

If n is any integer, then $\int_0^\pi e ^{\cos ^2 x} \cos ^3(2 n +1) x d x=$

If $\text{y}=\frac{\text{ax}+\text{b}}{\text{x}^2+\text{c}},$ then $(2\text{xy}_1+\text{y})\text{y}_3=$

If $\cot \theta+\tan \theta=2 \operatorname{cosec} \theta$, the general value of $\theta$ is

The area bounded by y = √x and line x = 2y + 3, X-axis in first quadrant is

The perpendiculars are drawn to lines $L_1$ and $L_2$ from the origin making an angle $\frac{\pi}{4}$ and $\frac{3 \pi}{4}$ respectively with positive direction of $X$-axis. If both the lines are at unit distance from the origin, then their joint equation is