Question

A test is given and the average (μX) score was 190, with a SD (σX) of...

A test is given and the average (μX) score was 190, with a SD (σX) of 50. Assuming a normal distribution for the grades, find the dividing line (test scores) between the A's, B's, C's, D's, and E's. The bottom 13% will be assigned the E's, the next 13% will be the D's, 50% will be the C's, the next 15% the B's and the top 9% will be the A's.

Math   Statistics-And-Probability   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

Below 134

 E
134 to 158 D
158 to 225.5 C
225.5 to 257.5 B
Above 257.5 A
0 0
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
Assume I give a test with a mean score of 84 and a standard deviation of...
Assume I give a test with a mean score of 84 and a standard deviation of 10. Draw a sketch of a normal distribution centered at the mean of 84 and divide it into 5 regions based on the following grades: The top 10% of scores receive an A The next 20% of scores receive a B The middle 40% of scores receive a C The next 20% of scores receive a D The bottom 10% of scores receive an...
forty students took a test on which the mean score was an 82 and standard deviation...
forty students took a test on which the mean score was an 82 and standard deviation was 7.8. the distribution of the scores followed a normal model and a grade of B or better was assigned to all students who scored 85 or higher. approximately how many grades of B or better were given? (choose closest answer) (a) 8, (b) 10, (c) 14, (d) 28, (e) 35
Suppose we wanted to test whether or not the average SAT score at Brown University was...
Suppose we wanted to test whether or not the average SAT score at Brown University was significantly different from the average SAT score at Wassamatta University. Taking a random sample, we manage to get the following 7 scores from Brown students: Brown University: 1540    1600    1540    1480    1390    1340    1400    and the following 9 scores from Wassamatta students: Wassamatta University: 1440    1380    1390    1240    1400    1430    1240      1400    1200 Assuming that the variance in SAT scores for students at Brown and students at Wassamatta are the same, and assuming that both samples are taken...
7. A standardized​ exam's scores are normally distributed. In a recent​ year, the mean test score...
7. A standardized​ exam's scores are normally distributed. In a recent​ year, the mean test score was 21.4 and the standard deviation was 5.6. The test scores of four students selected at random are 13, 23, 9​, and 37. Find the​ z-scores that correspond to each value and determine whether any of the values are unusual. The​ z-score for 13 is __. ​(Round to two decimal places as​ needed.) The​ z-score for 23 is __. ​(Round to two decimal places...
0. Consider a distribution of raw scores in which the distribution is normal. Consider that each...
0. Consider a distribution of raw scores in which the distribution is normal. Consider that each and every score is converted into a standard score (a z score), such that the resulting distribution is a normal distribution of standard scores (a standard normal distribution, also known as the SND). The standard normal distribution has all the following characteristics, except a. The distribution is bell-shaped. b. The distribution is symmetrical. c. The mean, median, and mode of the distribution are equal...
1. The mean clotting time of blood is 7.45 seconds with a standard deviation of 3.6...
1. The mean clotting time of blood is 7.45 seconds with a standard deviation of 3.6 seconds. What is the probability that an​ individual's clotting time will be less than 7 seconds or greater than 8 ​seconds? Assume a normal distribution. This problem can be solved using technology or the table for the standard normal curve from your text. 2. A teacher gives a test to a large group of students. The results are closely approximated by a normal curve....
Question 11 options: that scores above the mean are distributed the same as scores below the...
Question 11 options: that scores above the mean are distributed the same as scores below the mean that extreme scores are possible in a normal distribution that there are an infinite number of possible normal distributions that this characteristic has no practical implication Question 12 (1 point) In a normal distribution with 3±1 (M±SD), a researcher can appropriately conclude that about 84.13% of scores were greater than 2. Question 12 options: True False Question 13 (1 point) The mean, median,...
Your class has been given a test to assess educational experience. The mean on the test...
Your class has been given a test to assess educational experience. The mean on the test was 74 and the standard deviation was 10. Assuming a normal distribution, use this information and the standard normal table to answer questions 12-15. You must show all work to receive credit. Round to 3 decimal places throughout. 12. What percentage of students scored between 77 and 86? (6 points) 13. What percentage of students scored between 67 and 91? (6 points) 14. What...
Calculate the mean, median, mode, variance (population) and standard deviation (sample) for the following test grades:...
Calculate the mean, median, mode, variance (population) and standard deviation (sample) for the following test grades: 65, 60, 67, 71, 75, 80, 65 Use this information to answer questions #1-4. Question 1 (0.5 points) Saved The mode is: Question 1 options: 65 60 There is no modal category 75 71 Question 2 (0.5 points) Saved The median is: Question 2 options: 67 65 80 66 None of the above Question 3 (0.5 points) What is the approximate population variance for...
Delta airlines case study Global strategy. Describe the current global strategy and provide evidence about how...
Delta airlines case study Global strategy. Describe the current global strategy and provide evidence about how the firms resources incompetencies support the given pressures regarding costs and local responsiveness. Describe entry modes have they usually used, and whether they are appropriate for the given strategy. Any key issues in their global strategy? casestudy: Atlanta, June 17, 2014. Sea of Delta employees and their families swarmed between food trucks, amusement park booths, and entertainment venues that were scattered throughout what would...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT