Stats- need someone to check

Doing this assignment and was wondering if i got the right answers

According to the Census Bureau publication Current Population Reports, the probability distribution for household size (number of people per household, say X) in the United States is as follows. For the purpose of the next two questions, the experiment consists of randomly selecting a household in the United States and observing the number of people living there.
x 1 2 3 4 5 6 7
P(X = x) 0.16 0.32 0.05 0.31 0.10 0.05 0.01

How many people can we expect to see living in the randomly chosen household?






What is the probability that the randomly selected household will contain more than 4 people?






For the first one i got 1.79 and for the second i don't know if i did it right but i got .53

asked by Ryan
  1. The expectation value, or mean value, is the sum of the x*P(x) products, which is 3.06

    Of course, one would not expect to find 6% of a person in a house. On the other hand, 3 is a relatively unlikely number for this distribution. 2 and 4 are seen much more often.

    I do not like the way the question is worded. If they want the mean vaue, they should say so.

    For the second, you do not need to use a normal distribution and compute the standard deviation etc.. Just add P(5), P(6) and P(7). You get 0.16

    posted by drwls
  2. Thanks drwls

    posted by Ryan

Respond to this Question

First Name

Your Response

Similar Questions

  1. Science

    In science, my teacher gave out an assignment where we had to group the months of the year, kind of like the seasons. I have absolutely no ideas, and was wondering if anyone else had some input on the assignment.
  2. philosophy

    I am to identify a film, television show, or other form of media art that involves cahracters/narrators reflecting upon the nature of identity and self. I want to write about Sex and the City. i was wondering do you think this
  3. business

    1. CheckPoint: Identifying Fallacies • Resource: Ch. 6 End-of-Chapter Exercises and the Answers, Suggestions, and Tips for Triangle Exercises section of Critical Thinking • Complete Exercise 6-6 on pp. 194-196 of Critical
  4. HCA/220

    Hello, I am working on an assignment and I am stuck. Was wondering if you can help? This assignment states: determine the primary function of the following system components. Then states Function- What is the type of muscle
  5. Algebra

    I was wondering if someone could check over these answers for me. Find the slope between the set of given points: a) (3,-6) & (-2,-7)=2.6 b) (7,5) & (7,-4) = -9 c) (0,-5) & (16,-5)= 16 I just wondered if the answers I have are
  6. "Jiskha" Question

    So who exactly answers any homework questions I have for school? IM just wondering ya'know?How reliable are the answers? ~fanofchan
  7. Dissappering Answers

    Hi Jiskha! I was wondering why I see answers from people like: Ms. T and Alica Cunn And 5 minutes later there are gone! Why did that happen? Can I do that too? Thanks! Aimme
  8. Article finding

    Hi, I was wondering where I can find some articles on cognitive or abnormal psychology for an assignment.
  9. Cultural Diversity

    I am working on an autobiographical research paper that analyzes the influences of race as it relates to your community. Can someone please answer a few of the following questions to help me with different openions on the subject?
  10. To Carol -- science

    I've removed your post with the long, complex assignment that expects you to do research and thinking. If you have a specific question about this assignment, please post it along with your ideas about possible answers to it.
  11. U.S. History

    I was wondering if you could help me again. I just finished reading my chapter assignment on City Culture. My instructor is asking us to describe the social, economic, and political changes that played a role in changing city

More Similar Questions