Let X be a random variable and Y = 2X + 1. What is the variance of Y i

1.	Let X be a random variable and Y = 2X + 1. What is the variance of Y if the variance of X is 5?
Answer» Given X is a random variable and Y = 2X + 1 and Var(X ) = 5 Var (Y) = Var (2X + 1) = (2)² = 4 Var X = 4(5) = 20

Let X be a random variable and Y = 2X + 1. What is the variance of Y if the variance of X is 5?

Answer»

Given X is a random variable and Y = 2X + 1 and Var(X ) = 5

Var (Y) = Var (2X + 1) = (2)² = 4

Var X = 4(5) = 20