# Curving Grades Using a Normal Distribution| Total Assignments Help

Dr. Smith, a biology professor at Bradford University, has decided to give his classes a standardized biology exam that is nationally normed. This indicates that the normal distribution is an appropriate approximation for the probability distribution of students’ scores on this exam. The probability distribution of students’ scores on this standardized exam can be estimated using the normal distribution shown below.
1. State the mean of the distribution of the biology exam scores.
2. State the standard deviation of the distribution of the biology exam scores.
Originally, Dr. Smith decides to curve his students’ exam grades as follows.
3.
4.
• • • • •
• • • •
Students whose scores are at or above the 90th percentile will receive an A. Students whose scores are in the 80th -89th percentiles will receive a B. Students whose scores are in the 70lh-79,h percentiles will receive a C. Students whose scores are in the 60th 69,h percentiles will receive a D. Students whose scores are below the 6O’h percentile will receive an F.
Find the z-scores that correspond to the following percentiles.
90th percentile
80th percentile —— – 70th percentile
60th percentile
Using that information, find the exam scores that correspond to the curved grading scale. Assume that the exam scores range from 0 to 100. (Round to the nearest whole number.)
A: -100 B: –
C: – D:-
F: 0- 2
37?
6
Chapter 6 Normal Probability Distributions
5. The following is a partial list of grades for students in Dr. Smith’s class. Using the grading scale you just created, find the new curved letter grades that the students will receive on their tests given their raw scores.
Biology E
Name
82/B
Bill 77/C
Susie 91 /A
Troy 86/B
Sharon Laura
75/C 66/D 88/B 69/D
Eric
Marcus Stephanie
79/C
378
After reviewing the results, Dr. Smith decides to consider an alternate curving method. He decides to assign exam grades as follows.
6.
• • • • •
A: Students whose scores are at least two standard deviations above the mean of the standardized test.
B: Students whose scores are from one up to two standard deviations above the mean of the standardized test.
C: Students whose scores are from one standard deviation below the mean up to one standard deviation above the mean of the standardized test.
D: Students whose scores are from two standard deviations below the mean up to one standard deviation below the mean of the standardized test.
F: Students whose scores are more than two standard deviations below the mean of the standardized test.
Using the previous information, create Dr. Smith’s new grading scale. (Round to the nearest whole number.)
A: -100
B:
Cl – – __________ D: –
F: 0-

Need help? Hire an academic writer now.

## Order NOW to get 15% Discount!

Pages
{{total || ""}}

Why Choose Us

Top Quality and Well-Researched Papers

Keeping in mind your instructions and guidelines, our writers ensure to do extensive research before beginning to write. Unique and quality paper is our top priority.

Our team of writers and editors have many years of experience in academic writing. They are native English speakers and able to handle any academic task with ease.

Free Unlimited Revisions

We offer free unlimited revision to our clients. Whenever you feel the need to revise your work submit to our able editors. Our editors will ensure that your paper will be revised to meet your guidelines.

Prompt Delivery and 100% Money-Back-Guarantee

As a team we work hard to ensure a timely delivery of your papers. All you need to do is specify the time frame that you want you paper be submitted. We will work round the clock to beat the deadline.

Original & Confidential

We value your confidentiality and all our payment method are secure. We also use high end writing tools to ensure that all papers delivered are unique.

Our customer support team are available 24/7 to accept your orders and queries. We are committed to provide you with the best customer experience.

What Our Paper Writing Service Guarantees

You do not have to worry on what to expect because at mypaperwriterspro.com we guarantee you;

Our team of writers and editors is composed of people with diverse writing experiences. All of them have a Ph.D. They are all Ph.D. or M.A. graduates with extensive experience in academic and essay writing. We offer high-quality, original academic writing at an affordable cost.

Every order is written from scratch. We ensure that your papers conform to English conventions and the requirements of your discipline. To ensure originality, we also perform originality checks on all academic papers. Our success rate is 99% and many of our clients achieves their desired grades.

## Zero-plagiarism policy

Mypaperwriterspro has a strict anti-plagiarism policy. To ensure that your paper is not flagged as plagiarism, we take extra precautions when writing it. Professional plagiarism detection software is used by our custom paper experts.

Mypaperwriterspro takes the privacy of clients' information very seriously. Mypaperwriterspro does not disclose any information about our transactions with third-party services. Nobody will ever know that you have hired our paper writing service to help with your paper.

Our website offers online security for our customers. Your passwords and personal information are protected and cannot be accessed by anyone else. Our customers are assured that their accounts will not be compromised by hackers. Learn more about the data that we store and how it is used in our privacy statement.

## Free revision

When you order our paper service, you get unlimited free revisions and unlimited drafts. We will ensure that you submit flawless papers. Our paper help website allows you to request multiple revisions.

If the order form indicates that modifications or adjustments are required, only those should be made. These guidelines include, but are not limited to:

• Revision instructions should not conflict with your original instructions.
• You can request a modification before the purchase is approved. However, there is a 14-day grace period in which you can do this.

You can reach us by email, phone, and live chat. We are always interested in hearing from our customers. We welcome any feedback regarding our paper assistance service. Our customer service representatives are available 24/7, even on holidays and weekends. They can help you place orders, check the status of your order, answer questions, or simply provide information.

Chat with your paper specialist via our live chat. Our professionals are available for unlimited chats. All your questions will be answered within minutes

## Money-back guarantee

Do you still feel dissatisfied with your final paper? Don't worry. Mypaperwriterspro is committed to customer satisfaction.

Although it is rare, you can request a partial or full refund if your final paper is not written to your satisfaction. Mypaperwriterspro views our money-back guarantee more as a right than a benefit.

We believe that our clients deserve the best paper services available online. We offer a simple and straightforward refund process if you are not satisfied with the paper.

You can now contact our live agent via Whatsapp via +1(954) 751-1024
You will get free custom written paper ready for submission to your Blackboard