If `x` is a random variable, `var(x)=2` then `var(2x+3)=`

If X is a random variable such that sigma(X)=2.6 , then sigma(1-4X) is equal to

If X is discrete random variable takes the values x_1, x_2, x_3 , ... x_n then sum_(i=1) P(x_i) = ........

If X be a random variable taking values x_(1),x_(2),x_(3),….,x_(n) with probabilities P_(1),P_(2),P_(3) ,….. P_(n) , respectively. Then, Var (x) is equal to …….. .

For a random variable X, if Var (X) = 4 and E(X^(2))=13 , the value of E(X) is

For a random variable X, it is given,E(X)=10 and Var(X)=25. Find the positive values of a and b such,that Y=aX-b have expectation 0 and variance 1.

If the variance of the random variable X is 5 ,then variance of the random variable -3X is

For a random variable X, E(X)=3 and E(X^2)=11 Then, variance of X is

If x and y are random variables having expected values as 4.5 and 2.5 respectively, then the expected value of (x-y) is