STP 421/598 Probability, Fall 2008
TuTh 1:30 - 2:45pm, PSA 309 Instructor E-mail Office Office Hours Required Text Prerequisites Course Site
Dr. Yan Yang yy@math.asu.edu
PSA 745, Department of Mathematics and Statistics 4:15-5:15pm TuTh, or by appoi

STP421, Sample Exam 2
Provide the necessary explanations and show all important steps. Points will be deducted for poorly
presented solutions. Cross out incorrect work. Use blank sides of the sheets if you need more space.
In the problems below you may ne

STP421, Sample Exam 1 Solutions
1. (15 pts.) In an election there are three candidates. In a survey people are asked whether they
know the candidates. We got only some fragments of the survey. Fill in the missing statements,
set relations, and set sizes.

STP421, Sample Exam 2 Solutions
1. Let Y1 be the number of successes in 3 trials with probability of success equal to 1/2, Y2 be standard
2
exponential, and let Y3 have density f3 (y) =
your answers.
(y2)
1 e 8
8
(where y R). Do not forget to explain
(a)

STP421, Sample Exam 1
1. (15 pts.) In an election there are three candidates. In a survey people are asked whether they
know the candidates. We got only some fragments of the survey. Fill in the missing statements,
set relations, and set sizes. A, B, and

STP421, Sample Exam 2 Solutions
1. Let Y1 be the number of successes in 3 trials with probability of success equal to 1/2, Y2 be standard
(y 2)
1 e 8
8
exponential, and let Y3 have density f3 (y ) =
your answers.
2
(where y R). Do not forget to explain
(a

STP421, Sample Exam 1 Solutions
1. (15 pts.) In an election there are three candidates. In a survey people are asked whether they
know the candidates. We got only some fragments of the survey. Fill in the missing statements,
set relations, and set sizes.

STP421, Sample Exam 2
Provide the necessary explanations and show all important steps. Points will be deducted for poorly
presented solutions. Cross out incorrect work. Use blank sides of the sheets if you need more space.
In the problems below you may ne

STP421, Sample Exam 1
1. (15 pts.) In an election there are three candidates. In a survey people are asked whether they
know the candidates. We got only some fragments of the survey. Fill in the missing statements,
set relations, and set sizes. A, B, and

STP 421 - Problem Set 3 Solutions (Fall 2016)
1.) Suppose that X is a discrete random variable that takes values in the set cfw_2, 1, 1, 2 with
the following probabilities: P(X = 2) = P(X = 2) = 2/5 and P(X = 1) = P(X = 1) = 1/10.
Calculate the following