View the step-by-step solution to:

Assume that ages of moviegoers are normally distributed with a mean of 35 years and a standard deviation of 20 years.

1.    Assume that ages of moviegoers are normally distributed with a mean of 35 years and a standard deviation of 20 years.

a.    What is the percentage of moviegoers who are younger than 30 years of age.





b.   Find ,which is the 25th percentiles.






c.     Find the probability that a simple random sample of 25 moviegoers has a mean age that is less than 30 years.







d.    Find the probability that the simple random sample of 25 moviegoers, each of the moviegoers is younger than 30 years of age. For a particular movie and showtime, why might it not be unusual to have 25 moviegoers all under the age of 30.

Recently Asked Questions

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