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: � "!= 0.15 X1 + 0.35 X2 + 0.20 X3 +  0.30 X4. What is the variance of �  "!

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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: �
"!= 0.15 X1 + 0.35 X2 + 0.20 X3 + 
0.30 X4.
What is the variance of � 
"!

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