Let X1,X2,X3,and X4 be a random sample of observations from a population with mean μ and variance σ2.Consider the following estimator of μ: 
1 = 0.15 X1 + 0.35 X2 + 0.20 X3 + 0.30 X4.What is the variance of 
1?
Definitions:
Double Bond
A chemical bond in which two pairs of electrons are shared between two atoms, usually making the compound more reactive than a single bond.
Molecule
A molecule is a group of two or more atoms held together by chemical bonds.
Single Bonds
Chemical bonds formed by the sharing of one pair of valence electrons between two atoms, characterized by their relatively low energy.
Carbon Monoxide
A colorless, odorless, and tasteless gas with the chemical formula CO, highly toxic to humans and animals when inhaled.
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