Question: Assume X and Z is a continuous random variable with mu(x) = 6 and variance(x) = 3 and mu(z) = 1 and variance(z) = 3).

Assume X and Z is a continuous random variable with mu(x) = 6 and variance(x) = 3 and mu(z) = 1 and variance(z) = 3). X and Z have a covariance of 4 and are therefore not independent.

What is the variance of Y = 2X + Z

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