Normal rvs_bb - THE NORMAL DISTRIBUTION OTHER CONTINUOUS...

This preview shows 1 out of 3 pages.

THE NORMAL DISTRIBUTION, OTHER CONTINUOUS DISTRIBUTIONS, AND SAMPLING DISTRIBUTION 1. In its standardized form, the normal distribution a) has a mean of 0 and a standard deviation of 1. b) has a mean of 1 and a variance of 0. c) has an area equal to 0.5. d) cannot be used to approximate discrete probability distributions. 2. Which of the following about the normal distribution is NOT true? 3. If a particular batch of data is approximately normally distributed, we would find that approximately 4. For some positive value of Z , the probability that a standardized normal variable is between 0 and Z is 0.3770. The value of Z is 5. For some value of Z , the probability that a standardized normal variable is below Z is 0.2090. The value of Z is a) - 0.81. b) - 0.31. c) 0.31. d) 1.96. 6. For some positive value of Z , the probability that a standardized normal variable is between 0 and Z is 0.3340. The value of Z is
Image of page 1

Subscribe to view the full document.

7. For some positive value of X , the probability that a standardized normal variable is between 0 and + 2 X is 0.1255. The value of X is 8. For some positive value of X , the probability that a standardized normal variable is between 0 and +1.5 X is 0.4332. The value of X is 9. A catalog company that receives the majority of its orders by telephone conducted a study to determine how long customers were willing to wait on hold before ordering a product. The length of time was found to be a random variable best approximated by an exponential distribution with a mean equal to 3 minutes. What proportion of customers having to hold more than 4.5 minutes will hang up before placing an order? a) 0.22313 b) 0.48658 c) 0.51342 d) 0.77687 10. A catalog company that receives the majority of its orders by telephone conducted a study to determine how long customers were willing to wait on hold before ordering a product. The length of time was found to be a random variable best approximated by an exponential distribution with a mean equal to 3 minutes. What proportion of customers having to hold more than 1.5 minutes will hang up before placing an order?
Image of page 2
Image of page 3
You've reached the end of this preview.

{[ snackBarMessage ]}

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