STT 200/LECTURES 01 AND 06/SO8
HOMEWORK
#3
DUE ON
Friday, March14, 2008
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Number of points for each problem is in brackets [ ].
1.
[12] A couple plans to have children until they get a girl, but they agree that they will not have
more than three children even if all are boys. (Assume boys and girls are equally likely.)
(a) Create a probability model for the number of children they’ll have.
(b) Find the expected number of children.
(c) Find the expected number of boys they’ll have.
2
.
[14]
A sporting goods store announces a “Wheel of Savings” sale.
Customers select the merchandise they want to purchase, then at the
cash register they spin a wheel to determine the size of the discount
they will receive. The wheel is divided into 12 regions, like a clock.
Four of those regions are red, and award a 5% discount. The three
white regions award a 10% discount, two blue regions a 25% discount,
two green regions a 30%. The remaining region is gold, and a
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 Spring '08
 dikong
 Probability theory, Automobile, Compact Disc, ovarian cancer

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