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Homework 2
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Homework must be answered in the order shown here (else please make a note telling the reader
where it is).
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Please, staple the homework.
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Write your answers neatly
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Work must be shown for full credit
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No late homework accepted under any circumstances
1.
Ninety eight percent of all babies survive delivery. However, 15 percent of all births involve Cesarean
( C ) sections, and when a C section is performed the baby survives 96 percent of the time. If a randomly
chosen pregnant woman does not have a C section, what is the probability that her baby survives?
2.
In a certain community, 36 percent of the families own a dog, and 22 percent of the families that own a
dog also own a cat. In addition, 30 percent of the families own a cat. What is
(a)
The probability that a randomly selected family own both a dog and a cat
(b)
The conditional probability that a randomly selected family owns a dog given that it owns a cat?
P
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 Summer '07
 Wu
 Probability

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