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Spring 2008
Problem Set #4
Posted: February 25
th
, 2008
Due: March 3
rd
, 2008
From the textbook, solve the following problems:
(Correct final answers get full credit. Showing work is not necessary)
4.14
(15 points, 5 points for the first answer, and 10 points for the second
answer)
Ans.
Prob (Both are type O)=(.45)(.35)=
.1575
Prob (both are the same type)
=P (both are type O or
both are type A or
both are type B or
both are type AB )
=P(both are type O)+ P(both are type A)+ P(both are type B)+ P(both are type
AB)= (.45)(.35)+ (.40)(.27)+ (.11)(.26)+ (.04)(.12)=
.2989
4.16
(10 points, 5 points for the first answer, and 5 points for the second answer)
Ans.
Prob(Other language)= 1 Prob (English or French or Asian/pacific)
=1 (.59+.23+.07)
=
.11
Prob (Not English)= 1 Prob (English)
=1 0.59
=
.41
4.19 (15 points)
Ans.
If P(Red Sox win) = P(Angels win) = x, then P(Athletics win) = P(White Sox
win) = x/3, and
0
.
6 +
x
+
x
+
x/3
+
x/3
=1
We can solve this equation for x.
x
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 Spring '08
 ABDUS,S.

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