STA 4321/5325  Spring 2010
Sample Exam 4
Note: This is an example adapted from previous STA 4321/5325 exams. It is intended to be of
approximately the same length and style as the actual exam. However, it is NOT guaranteed to
match the content or coverage of the actual exam. DO NOT use this as your primary study tool!
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•
This is a 50 minute exam. There are 4 problems, worth a total of 40 points.
•
You may use one lettersize sheet of your own notes and a standard scientific calculator. You
may
not
use any other references (e.g. books, notes, or textcapable devices).
•
You are not required to bring a calculator – you may leave your answers in an arithmetic
form from which the numerical answer could be immediately calculated.
•
Remember to show your work.
Answers lacking adequate justification may not receive
full credit.
•
Write all answers in the spaces provided. If you require more space to write your answer, you
may use the back side of the page.
•
Please have your UF student ID card available.
1
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Problem 1:
The joint probability mass function of discrete random variables
X
and
Y
is given
in the table below. (For
x
or
y
not in the table,
p
(
x,y
) = 0.) The value of
c
is constant.
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 Spring '08
 Staff
 Probability, Probability theory, pts, probability density function, Probability mass function

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