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【单选题】
设X1,X2,......,Xn为来自于总体P( 入 )的简单随机样本(这里的1,2,......,n均为下标,下同),统计量T=(X1+X2+......+Xn)/n,则E(T)和D(T)分别为A.
E(T)=入，D(T)=入
B.
E(T)=入，D(T)=入/n
C.
E(T)=入/n，D(T)=入
D.
E(T)=入/n，D(T)=入/n
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举一反三
【单选题】Which of the following is NOT the reason for which Bank of America thrived?
A.
It's turf -- California was a state with a large number of population.
B.
The economic environment that was controlled by the government.
C.
Its deposit rate was higher than that of other banks.
D.
Its large amount of branches.
【简答题】强化学习中,()主要探索未知的动作会产生的效果,有利于更新Q值,获得更好的策略。
【简答题】Which of the following is NOT the reason to the different economic behaviour between two generations?（ ）
【多选题】Which is the reason that the construction is unfinished?
A.
lack of funding
B.
lack of interest
C.
lack of manpower
D.
Political reason
【单选题】Which of the following best illustrates the relation between reason and revelation?
A.
They are simply identical.
B.
Revelation guides reason.
C.
They are occasionally contradictory.
D.
Reason is used to perfect revelation.
【简答题】Which of the following is the reason for the increasing private health care?
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