The uniform order mean is E X_(k)=kθ/(n+1). Hence E(3X_(2))=3·2θ/6=θ. For Q,the law of total variance gives Var(2X_(3))=Var[E(2X_(3)|X_(5))]+E Var(2X_(3)|X_(5)),and the last term is nonnegative. Both hold. **C**.
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