What kinds of web sites do males aged 18 to 34 visit

This preview shows page 1 - 2 out of 2 pages.

7.What kinds of Web sites do males aged 18 to 34 visit most often? Half of male Internet users in this age group visit an auction site such as eBay at least once a month. A study of Internet use interviews a random sample of 500 men aged 18 to 34. Let X = the number in the sample who visit an auction site at least once a month. a.Find the probability that 274 males aged 18 to 34 visit an auction site at least once a month. b.Show that X is approximately Normal. c.Find the mean and standard deviation of X. d.Estimate the probability that at least 235 of the men in the sample visit an online auction site at least once a month. 8. To start her old lawn mower, Rita has to pull a cord and hope for some luck. A lawn mower mechanic tells her that on any particular pull, the mower has a 20% chance of starting. a. How many times do we expect Rita will have to pull the mower for it to start? b. Find the probability that it takes her exactly 3 pulls to start the mower. Show your work.
Image of page 1
c. Find the probability that it takes her more than 10 pull to start the mower. Show your work. d. In fact, it took Rita 30 pulls until the mower finally started, do we suspect that the lawn mower mechanic was untruthful?
Image of page 2

You've reached the end of your free preview.

Want to read both pages?

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

Stuck? We have tutors online 24/7 who can help you get unstuck.
A+ icon
Ask Expert Tutors You can ask You can ask You can ask (will expire )
Answers in as fast as 15 minutes
A+ icon
Ask Expert Tutors