MCQs Random Variables 4

1. If $X$ and $Y$ are independent random variables then $SD(X-Y)$ will be

2. If $Var(X) = 5$ then $Var(2X + 5) $ =

3. $E(X-\mu)$ = ?

4. If $X$ and $Y$ are random variables then $E(X-Y)$ is

5. If $X$ and $Y$ are two independent variables then $E(XY)=$

6. If $X_!, X_2, \cdots, X_n$ is the joint density of $n$ random variables, say $f(X_1, X_2, \cdots, X_n;\theta)$ which is considered to be a function of $\theta$. Then $L(\theta; X_1,X_2,\cdots,X_n)$ is called:

7. If $a$ is constant then $Var(a)$ is

8. If $E(X) = 3$ then what will be $E(a+X)$, where $a$ is a constant whose value is 2

9. If $X$ is a random variable and $a$ and $b$ are constants, then $SD(a-bX)$ is

10. If $Var(X) = 8$ then $Var(X+3)= $

11. If $E(X) = 1.6$ then $E(5X+10) =$?

12. If $X$ is a random variable then $E(4X + 2)$ is

13. If $P(X=10) = \frac{1}{10}$, then $E(X)=$?

14. A discrete variable is a variable than can assume

15. If $Var(X) = 2$ and $Var(Y) = 5$, and if $X$ and $Y$ are independent variables, then $Var(2X – Y)=$?