Math 13800
Exam 2
Spring 2010
1
For #13, CIRCLE THE LETTER OF THE CORRECT ANSWER.
(7 pts)1.
Find a function rule for the number of toothpicks to make Shape
n
in the following pattern:
Shape 1
Shape 2
Shape 3
.3 4
.4 4
.4 3
.3 3
.
None of the above
An
Bn
Cn
Dn
E
+
+
+
+
(7 pts)2. On Elm Street, there are 27 houses of which 8 do not
have a garage. Morgan lives on Elm Street.
Determine the odds in favor of Morgan living in a house that has
a garage.
.8:19
.19:27
.8:27
.27:35
.19:8
A
B
C
D
E
(7 pts)3. Of these three statements, which are referring to a population parameter?
I.
In Mr. Hobson’s fifthgrade class, cats are the favorite pet of 55% of the students.
II. The newspaper surveyed voters in the city of Chicago and found that 48% are opposed to the
school funding proposal.
III. The average GPA of all current members of a certain sorority is 3.24.
. II only
. III only
. I and II only
. I and III only
. II and III only
A
B
C
D
E
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Exam 2
Spring 2010
2
(8 pts)4. In an arithmetic sequence, each entry after the first is obtained by adding a fixed number to the
previous entry.
Fill in the blanks for this arithmetic sequence:
2.4,
3.1,
3.8,
4.5,
_____,
_____, _____;
the 20
th
entry is: __________
Complete this sentence:
In a geometric sequence, each entry after the first is obtained by
_________________________________________________________________________
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 Spring '09
 Math, Addition, Probability theory, Summation, Geometric progression

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