Show transcribed image text Problem 8) Suppose X and Y are two random variables with variances 5 and -3. Find the variance of the random variable Z =-2X + 4-3 for the following cases. a) When X and Y are independent. When X and Y are not independent, but we know that Ïƒn-1. b)

Problem 8) Suppose X and Y are two random variables with variances 5 and -3. Find the variance of the random variable Z =-2X + 4-3 for the following cases. a) When X and Y are independent. When X and Y are not independent, but we know that Ïƒn-1. b)