100 POINTS!!!
8.1.5 Suppose that (x1, ..., xn) is a sample from an N(μ,σ^2) distribution, where μ ∈ R is unknown and σ^2 is known. Is 2x + 3 a UMVU estimator of anything? If so, what is it UMVU for? Justify your answer according to the key answer This is a UMVU estimator of 5+2µ.
