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【多选题】
下列数字的有效数字位数为3的是( )。
A.
0.235
B.
3.020
C.
0.405
D.
5.69
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【单选题】设X为随机变量,若数学期望E(X)存在,则数学期望E(E(X))=__________。
A.
E(X)
B.
0
C.
D.
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【简答题】A.Deposit some money in a bank. B.Read the lease carefully and sign it. C.Ask the landlord for a damage deposit. D.Sign the contract and pay a security deposit.
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