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Given yield measurements ?1,?2,?3 from three independent runs of an experiment with variance ?2 , which...

Given yield measurements ?1,?2,?3 from three independent runs of an experiment with variance ?2
, which is the best estimators?
?̂1=(9X1+X2)/10
?̂2=(3X1+X2)/4
?̂3=(X1+X2)/3

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