成果参考介绍共tutwk4.pdfVIP

COMP211DataandSystemModeling(PROB/STAT)

Tutorial(Week3)

1)Considertheexperimentofdrawingonecardfromastandarddeckof52cards.LetAbetheevent

thataclubisselected,letBbetheeventthatafacecard(jack,queen,orking)isdrawn,andletCbethe

eventthatajackisdrawn.

a)IsAandBt?

b)IsBandCt?

2)Twofairdicearerolled.Whatistheconditionalprobabilitythatatleastonelandson6giventhatthe

dicelandondifferentnumbers?

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3)Asmallhospitalhas40physiciansonstaff,ofwhich5arecardiologists.Theprobabilitythattwo

randomlyselectedphysiciansarebothcardiologistsisdeterminedasfollows.LetAbetheeventthatthe

firstselectedphysicianisacardiologist,andBtheeventthatthesecondselectedphysicianisa

cardiologist.

WhatisP(AandB)?

4)Acomputerdiskmanufacturerhasthreelocationsthatproducecomputerdisks.TheOmahaplant

produces30%ofthedisks,ofwhich0.5%aredefective.TheMemphisplantproduces50%ofthedisks,

ofwhich0.75%aredefective.TheKansasCityplantproducestheremaining20%,ofwhich0.25%are

defective.Ifadiskispurchasedatastoreandfoundtobedefective,whatistheprobabilitythatitwas

manufacturedbytheOmahaplant?

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Comp211数据和系统建模（Prob/STAT）

（第3周）

1）考虑从52张标准甲板上绘制一张卡的实验。

选择了一个，让B是绘制面部卡（或国王）的，让C为绘制插孔的。a）是a和b独立

的吗？b）b和c是独立的吗？

2）两个公平的被滚动。鉴于6个有条件的概率是降落在不同的数字上？

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3）一家小型医院有40名员工，其中5位是心脏病专家。

随机选择的医生都是心脏病专家，如下所示。

第一个选择的医师是心脏病专家，b是第二个选定的医师是心脏病