题目内容

0.10mol/L FeCl3溶液与0.10mol/L SnCl2溶液等体积混合,平衡时体系电位是 ____。[已知φ¢ (Fe3+/Fe2+)=0.68V,φ¢ (Sn4+/Sn2+)=0.14V]

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设随机变量X 服从标准正态分布N(0,1),其分布函数为Φ(X),则P(X≥4)= ( )

A. Φ(4)
B. 2Φ(4)-1
C. 1-2Φ(4)
D. 1-Φ(4)

若φ(3)=0.9987,则标准正态总体在区间(-3,3)内取值的概率为( )

A. 0.9987
B. 0.9974
C. 0.944
D. 0.8413

1)Whatisthemangoingtodotonight?

A. Setuphismum’scomputer.
Buyhismumabirthdaygift.
C. Solvehisdadscomputerproblems.
D. Helphisdadchooseanewcomputer.

2)Whatdoesthemansaytheirparentswereunlucky?

A. Theyneverhadacomputeroftheirown.
B. Theyhadlittleornoexperiencewithcomputers.
C. Nobodytaughtthemhowtousecomputers.
D. Nobodyhelpedthemwiththeircomputerproblems.

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