View the step-by-step solution to:

An internet site has determined that the length of time that users spend on its site is normally distributed with a mean of 5.9 minutes and a...

 An internet site has determined that the length of time that users spend on its site is normally distributed with a mean of 5.9 minutes and a standard deviation of 1.8 minutes.

Find: 

(a) the probability that a user will stay on the site for more than 7 minutes.

(b) the probability that a user will stay on the site between 2 and 5 minutes.

(c) the 91st percentile for the length of time spent on the site (a time such that 91% of users stay less than that time).

(d ) the probability that a random sample of 30 users has a mean of more than 5.25  minutes on the site.

Top Answer

a)  P ( x > 7 ) = 0 . 2 7 0 9  b)  P ( 2 < x < 5 ) =... View the full answer

normal001.jpg

Sign up to view the full answer

Why Join Course Hero?

Course Hero has all the homework and study help you need to succeed! We’ve got course-specific notes, study guides, and practice tests along with expert tutors.

-

Educational Resources
  • -

    Study Documents

    Find the best study resources around, tagged to your specific courses. Share your own to gain free Course Hero access.

    Browse Documents
  • -

    Question & Answers

    Get one-on-one homework help from our expert tutors—available online 24/7. Ask your own questions or browse existing Q&A threads. Satisfaction guaranteed!

    Ask a Question
Ask a homework question - tutors are online