Question: A class has 80 students. Test 2 had a class average of 78 and a variance of 49. Assume normal distribution. Answer the following questions.

A class has 80 students. Test 2 had a class average of 78 and a variance of 49. Assume normal distribution. Answer the following questions. Assume a 90-80-70-60 = A--B-C-D scale.

  1. What is the probability of getting an A?
  2. How many will get an A?
  3. What is the probability of getting a B?
  4. What is the probability of getting a C?
  5. How many people will fail the class?
  6. If the bottom 5% will get an F, what will the cut-off score be?
  7. If the top 15% get an A, wht is the cutoff score for an A?

Step by Step Solution

There are 3 Steps involved in it

1 Expert Approved Answer
Step: 1 Unlock blur-text-image
Question Has Been Solved by an Expert!

Get step-by-step solutions from verified subject matter experts

Step: 2 Unlock
Step: 3 Unlock

Students Have Also Explored These Related Mathematics Questions!

Q:

A class has 80 students. Test 2 had a class average of 78 and a variance of 49. Answer the following 7 questions. (Assume Normal distribution). Assume a 90-80-70-60 = A-B-C-D scale. 1. What is the...

Q:

Kindly share step by step problem in manual calculation and with formulas (no internet and no website) QUESTION 1 A class has 80 students. Test 2 had a class average of 78 and a variance of 49....

Q:

need some help please QUESTION 1 A class has 80 students. Test 2 had a class average of 78 and a variance of 49. Answer the following 7 questions by finding the closest matches). (Assume Normal...

Q:

Need help please QUESTION 1 A class has 80 students. Test 2 had a class average of 78 and a variance of 49. Answer the following 7 questions by finding the closest matches). (Assume Normal...

Q:

A class has 80 students. Test 2 had a class average of 78 and a variance of 49. Answer the following 7 questions. (Assume Normal distribution). Assume a 90-80-70-60 scale; Do not round off answers....

Q:

QUESTION 1 A class has 80 students.Test 2 had a class average of 78 and a variance of 49.Answer the following 7 questions.(Assume Normal distribution).Assume a 90-80-70-60 = A-B-C-D scale. 1.What is...

Q:

Explain four assumptions associated with a linear regression model. (ii) Define Bayes' Theorem (iii) A mean of 60 on seven exams is needed to pass a course. On her first six exams, Tinah received...

Q:

COURSEIKURSUS ELEMENTARY STATISTICS PART A INSTRUCTIONS Part A contains FIVE questions. Answer ALL questions. QUESTION 1. Marks Identify which of the following variables are quantitative and which...

Q:

Nerd this in 1 hr paz 40$ 1 1. The stem-and-leaf diagram below displays the number of vacation days taken in 1997 by a sample of 40 employees of an electronics company. StemLeaves 000123334456889...

Q:

3.2 Identifying FR level of importance using factor analysis The level of importance of the FRs is determined in this study by the application of factor analysis (principal component technique). The...

Q:

Maltose and cellobiose (Section 25.14) are examples of disaccharides derived from Dglucopyranosyl units. (a) How many other disaccharides are possible that meet this structural requirement? (b) How...

Q:

Find all real numbers in the interval (0,2x] that satisfy the equation 5 cos (3x)-5 cos (x) = 0 Select the correct choice below and, if necessary, fill in the answer box to complete your choice OA....

Q:

if a population variance are assumed to be known in an application where a manager wishes to estimate the difference between two population means the 90 percent confidence interval estimate can be...

Q:

As you know, a companys return on investment (or ROI) is the product of its margin and turnover. Financial analysts often compute and analyze a companys ROI by obtaining the required data from its...