University of Phoenix Material
Practice Set 2
1. List the simple events for each of the following statistical experiments in a sample space.
a) One roll of a die.
Note: Separate your response with a comma (,). For example 22, 23, 24
b) Three tosses of a coin.
Note: Use this notation for your answer. heads = H. tails = T. For example HT, TH
c) One toss of a coin and one roll of a die.
Note: Use this notation. Heads = H or numbers 1, 2, 3, 4, 5, 6 for the dice. For example
H1 indicates heads and dice roll equal to 1.
2. Two students are randomly selected from a statistics class, and it is observed whether or not they suffer from math anxiety. Indicate which are simple and which are compound events.
a) Both students suffer from math anxiety.
b) Exactly one student suffers from math anxiety.
c) The first student does not suffer and the second suffers from math anxiety.
d) None of the students suffers from math anxiety.
3. A hat contains 40 marbles. Of them, 18 are red and 22 are green. If one marble is randomly selected out of this hat.
a) What is the probability that this marble is red (round to two decimal places)?
b) What is the probability that this marble is green (round to two decimal places?
4. Two thousand randomly selected adults were asked whether or not they have ever shopped on the Internet. The following table gives a twoway classification of the responses.

Have Shopped 
Have Never Shopped 
Male 
500 
700 
Female 
300 
500 
a) If one adult is selected at random from these 2000 adults, find the probability that this adult has never shopped on the Internet.
b) If one adult is selected at random from these 2000 adults, find the probability that this adult is a male.
c) If one adult is selected at random from these 2000 adults, find the probability that this adult has shopped on the Internet given that this adult is a female.
d) If one adult is selected at random from these 2000 adults, find the probability that this adult is a male given that this adult has never shopped on the Internet.
5. Find the joint probability of AA and BB for the following.
a) P(A)=.36 and P(BA)=.87
b) P(B)=.53 and P(AB)=.22
6. Classify each of the following random variables as discrete or continuous.
a) The time left on a parking meter
b) The number of bats broken by a major league baseball team in a season
c) The number of cars in a parking lot at a given time
d) The price of a car
e) The number of cars crossing a bridge on a given day
f) The time spent by a physician examining a patient
g) The number of books in a student’s bag
7. The following table gives the probability distribution of a discrete random variable x.
x 
0 
1 
2 
3 
4 
5 
6 
P(x) 
.11 
.19 
.28 
.15 
.12 
.09 
.06 
Find the following probabilities.
a) P(1≤x≤4)
b) Probability that x assumes a value less than 4.
Probability that x assumes a value greater than 2.
8. A limousine has eight tires on it. A fleet of such limos was fit with a batch of tires that mistakenly passed quality testing. The following table lists the probability distribution of the number of defective tires on this fleet of limos where xx represents the number of defective tires on a limo and P(x) is the corresponding probability.
x 
0 
1 
2 
3 
4 
5 
6 
7 
8 
P(x) 
.0454 
.1723 
.2838 
.2669 
.1569 
.0585 
.0139 
.0015 
.0008 
Calculate the mean and standard deviation of this probability distribution. Give a brief interpretation of the values of the mean and standard deviation.
9. Let xx be a discrete random variable that possesses a binomial distribution. Using the binomial formula, find the following probabilities.
a) p(5) for n=8 and p=.70
b) p(3) for n=4 and p=.40
Verify your answers by using Table I of Appendix B.
10. Let x be a discrete random variable that possesses a binomial distribution. If n = 5 and p = 0.8, then…
a) What is the mean (round to three decimal places)
b) What is the standard deviation of the probability distribution (round to three decimal places)?
Why Choose Us
Quality Papers
At Myhomeworkwriters.com, we always aim at 100% customer satisfaction. As such, we never compromise o the quality of our homework services. Our homework helpers ensure that they craft each paper carefully to match the requirements of the instruction form.
Professional Academic Writers
With Myhomeworkwriters.com, every student is guaranteed highquality, professionally written papers. We ensure that we hire individuals with high academic qualifications who can maintain our quality policy. These writers undergo further training to sharpen their writing skills, making them more competent in writing academic papers.
Affordable Prices
Our company maintains a fair pricing system for all academic writing services to ensure affordability. Our pricing system generates quotations based on the properties of individual papers.
OnTime delivery
My Homework Writers guarantees all students of swift delivery of papers. We understand that time is an essential factor in the academic world. Therefore, we ensure that we deliver the paper on or before the agreed date to give students ample time for reviewing.
100% Originality
Myhomeworkwriters.com maintains a zeroplagiarism policy in all papers. As such, My Homework Writers professional academic writers ensure that they use the students’ instructions to deliver plagiarismfree papers. We are very keen on avoiding any chance of similarities with previous papers.
Customer Support 24/7
Our customer support works around the clock to provide students with assistance or guidance at any time of the day. Students can always communicate with us through our live chat system or our email and receive instant responses. Feel free to contact us via the Chat window or support email: support@myhomeworkwriters.com.
Try it now!
How it works?
Follow these simple steps to get your paper done
Place your order
Fill in the order form and provide all details of your assignment.
Proceed with the payment
Choose the payment system that suits you most.
Receive the final file
Once your paper is ready, we will email it to you.
Our Homework Writing Services
My Homework Writers holds a reputation for being a platform that provides highquality homework writing services. All you need to do is provide us with all the necessary requirements of the paper and wait for quality results.
Essays
At My Homework Writers, we have highly qualified academic gurus who will offer great assistance towards completing your essays. Our homework writing service providers are wellversed with all the aspects of developing highquality and relevant essays.
Admissions
Admission and Business Papers
With Myhomeworkwriters.com, we will help you secure a position at your desired institution. Our essay writing services include the crafting of admissions papers. We will still help you climb your career ladder by helping you write the official papers that will help you secure a job. We will guide you on how to write an outstanding portfolio or resume.
Editing
Editing and Proofreading
Myhomeworkwriters.com has a professional editorial team that will help you organize your paper, paraphrase it, and eliminate any possible mistakes. Also, we will help you check on plagiarism to ensure that your final paper posses quality and originality.
Coursework
Technical papers
My Homework Writers harbors professional academic writers from diverse academic disciplines. As such, we can develop homework writing services in all academic areas. The simplicity or complexity of the paper does not affect the quality of homework writing services.