In an annual poll about consumption habits, telephone interviews wer.docx

This preview shows page 1 - 3 out of 3 pages.

Image of page 1

Subscribe to view the full document.

In an annual poll about consumption habits, telephone interviews were conducted for a random sample of 1,014 adults aged 18 and over. One of the questions was, "How many cups of coffee, if any, do you drink on an average day?" The following table shows the results obtained. (b) Compute the expected value of x. (Round your answer to three decimal places.) E(x) = �� (c) Compute the variance of x. (Round your answer to three decimal places.) Var(x) = �� (d) Suppose we are only interested in adults who drink at least one cup of coffee on an average day. For this group, let y = the number of cups of coffee consumed on an average day. Compute the expected value of y. (Round your answer to three decimal places.) Number of Number of Cups per Day Responses 0 365 1 264 2 193 3 91 4 or more 101 Define a
Image of page 2
Image of page 3

Unformatted text preview: random variable x = number of cups of coffee consumed on an average day. Let x = 4 represent four or more cups (a) Develop a probability distribution for x. (Round your answers to three decimal places.) Number of f(x) Cups per Day 0.360 1 0.260 0.190 2 3 0.090 4 or more 0.100 (b) Compute the expected value of x. (Round your answer to three decimal places.) E(x)1.3 (c) Compute the variance of x. (Round your answer to three decimal places.) Var(x) 3.42 X (d) Suppose we are only interested in adults who drink at least one cup of coffee on an average day. For this group, let y the number of cups of coffee consumed on an average day. Compute the expected value of y. (Round your answer to three decimal places.) E(y) = 2...
View Full Document

  • Fall '19

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern

Ask Expert Tutors You can ask bonus questions You can ask questions ( expire soon) You can ask questions (will expire )
Answers in as fast as 15 minutes