Given XXX has mean μ\muμ and variance σ2\sigma^2σ2, what is the variance of Y=−2X+5Y = -2X + 5Y=−2X+5?
−2σ2-2\sigma^2−2σ2
2σ22\sigma^22σ2
4σ24\sigma^24σ2
−4σ2+5-4\sigma^2 + 5−4σ2+5