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STAT 225
–
FALL 2010 Exam 1
Your Name:
___________________________________________
Your Instructor:
Jeff
Tianhong
Jeremy
Yong
YenNing
Mike
Zhaonan
Your class time (circle one):
7:30
8:30
9:30
10:30
11:30
12:30
1:30
2:30
3:30
4:30
Note:
Show your work on all questions.
Unsupported work will not
receive full credit.
All answers should be in decimal form and should be exact, or to
at least taken out to two decimal places.
You
are
responsible
for
upholding
the
Honor
Code
of
Purdue
University.
This
includes
protecting
your
work
from
other
students.
You are allowed the following aids:
a one
page 8 ½” x 11”
handwritten
(in
your
handwriting)
cheat
sheet,
a
scientific
calculator, and pencils.
Instructors will not interpret questions for you.
If you do have
questions, wait until you have looked over the whole exam so that
you can ask all of your questions at one time.
You must show your student ID (upon request) and turn in your
cheat sheet when you turn in your exam to your instructor.
Turn off your cell phone before the exam begins!
Question
Points Possible Points Received
1
15
2
11
3
12
4
13
5
10
6
11
7
14
8
13
Cheat Sheet
1
Total
100
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1.
In each of the following situations, there is a random variable
involved. Find its PMF either by name and parameter(s) or by finding
a PMF table. If an approximation can be made, you must name and
label both the exact and approximate distribution with corresponding
parameter(s) to receive full credit. (3 points each)
a).
A convenience store has 2000 cans of sodas in stock and 20% of
those cans have a coupon printed on them. Barney purchased 50 cans
of soda for his party and let C be the number of those 50 cans
having a coupon.
b).
A quarterback on a football team has an interception rate of
4.5% for his passing. During a game, he made 126 passing attempts
and let I be the number of interceptions.
c).
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 Spring '08
 MARTIN

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