The random variable X1 and X2 are independent and have varia

The random variable X1 and X2 are independent and have variance 3.0 and 2.0 respectively. What is the variance of X1-X2?

Solution

The random variable X1 and X2 are independent and have variance 3.0 and 2.0 respectively. What is the variance of X1-X2?

Var( x1-x2) = Var(x1)+Var(x2) = 3.0+2.0 = 5.0