Suppose the scores on an examhave a mean of 70 with a standarddeviation of 10. If one student has atest result with a z-score of -0.8and a second student has a testTesult with a z-score of 1.6, howmany points higher was thesecond student's score than that ofthe first?O a. 12O b. 10O C. 20O d. 2.4e. 24

Name: Suppose the scores on an examhave a mean of 70 with a standarddeviati
Uploaded: 2024-03-20T07:07:12.000Z
Channel: Bartleby
Description: Suppose the scores on an examhave a mean of 70 with a standarddeviation of 10. If one student has atest result with a z-score of -0.8and a second student has a testTesult with a z-score of 1.6, howmany points higher was thesecond student's score tha

Answered: Image /qna-images/answer/673aefba-259e-4964-9507-b625bf7e3d31.jpg

Math

Probability

Suppose the scores on an exam have a mean of 70 with a standard deviation of 10. If one student has a test result with a z-score of -0.8 and a second student has a test Tosult with a z-score of 1.6, how many points higher was the second student's score than that of the first? О а. 12 O b. 10 O C. 20 O d. 2.4 О е. 24

Suppose the scores on an exam have a mean of 70 with a standard deviation of 10. If one student has a test result with a z-score of -0.8 and a second student has a test Tosult with a z-score of 1.6, how many points higher was the second student's score than that of the first? О а. 12 O b. 10 O C. 20 O d. 2.4 О е. 24

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

See similar textbooks

Similar questions

You plan to set up a production system that includes 2 machines of Model X and 3 machines of Model Y, which produce exactly the same type of product. The standard deviations for the daily outputs of Model X and Model Y are 5 and 10 products, respectively. If the correlation between their daily outputs is - 0.5, what would be the standard deviation for the daily output of your overall production system (2X+ 3Y)? O A. 52 О В. 13 ОС. 26 OD. 39
When I need to determine which standard deviation would give the better grade, what if the z-score is negative such as -.8 and -.4. Wouldn't the .-4 score provide a better grade because it's closer to m=42? The oridinga score is 38 and the mean is 42 but there are two standard deviation scores of 5 (answer was -.8) and 10 (answer was -.4) and I need to decide which one give the better grade.
A researcher speculates that because of differences in diet, Japanese children have a lower mean blood cholesterol level than U.S. children do. Suppose that the mean level for U.S. children is known to be 175. Let ? represent the true mean blood cholesterol level for Japanese children. What hypotheses should the researcher test? H0: ? = 175 versus Ha: ? > 165H0: ? = 175 versus Ha: ? < 185 H0: ? = 175 versus Ha: ? < 175H0: ? = 175 versus Ha: ? > 175H0: ? = 185 versus Ha: ? > 175
The mean of a set of data is 238.39 and its standard deviation is 77.24. Find the z-score for a value of 419.9. Round to two decimal places. О А. 2.12 В. 2.35 С. 2.65 O D. 2.59
In Mr Samboko courses, the coeﬃcient of correlation between General biology I and General-biology II for 20 students is 0.3, Mean of General biology I and General-biology II are 15 and 20 respectively and also the standard deviation of General biology I and General-biology II are 4 and 5 respectively. At the time of calculation one item 27 has wrongly been taken as 17 for General biology I and 35 instead of 30 for General biology II. As a biostatistics student ﬁnd the correct coeﬃcient of correlation between General biology I and General-biology II for 20 students.
In Professor Friedman's economics course the correlation between the students' total scores prior to the final examination and their final-examination scores is r = 0.5. The pre-exam totals for all students in the course have mean 275 and standard deviation 38. The final-exam scores have mean 75 and standard deviation 6. Professor Friedman has lost Julie's final exam but knows that her total before the exam was 290. He decides to predict her final-exam score from her pre-exam total. (a) What is the slope of the least-squares regression line of final-exam scores on pre-exam total scores in this course? (Round your answer to four decimal places.) What is the intercept? (Round your answer to two decimal places.) (b) Use the regression line to predict Julie's final-exam score. (Round your answer to one decimal place.) -2 (c) Julie doesn't think this method accurately predicts how well she did on the final exam. Use r² to argue that her actual score could have been much higher (or much…
Jeremiah earned a score of 530 on Exam A that had a mean of 450 and a standard deviation of 40. He is about to take Exam B that has a mean of 63 and a standard deviation of 20. How well must Jeremiah score on Exam B in order to do equivalently well as he did on Exam A? Assume that scores on each exam are normally distributed.
Greg is in his first semester at a university and is taking a calculus course with a large enrollment. He just took the first midterm exam and is nervous about his score. Among all the students in the course, the mean of the exam was 85 with a standard deviation of 15.Find that grag has obtain less then 95.
In Professor Krugman’s economics course, the correlation between the students’ total scores prior to the final examination and their final‑examination scores is ?=0.5.r=0.5. The pre‑exam totals for all students in the course have mean 280280 and standard deviation 40.40. The final‑exam scores have mean 7575 and standard deviation 8.8. Professor Krugman has lost Julie’s ﬁnal exam but knows that her total before the exam was 300.300. He decides to predict her ﬁnal‑exam score from her pre‑exam total. (a) Which of the choices is the least‑squares regression line of ﬁnal‑exam scores on pre‑exam total scores in this course?
In Professor Krugman's economics course, the correlation between the students' total scores prior to the final examination and their final‑examination scores is ?=0.5.�=0.5. The pre‑exam totals for all students in the course have mean 280280 and standard deviation 40.40. The final‑exam scores have mean 7575 and standard deviation 8.8. Professor Krugman has lost Julie's ﬁnal exam but knows that her total before the exam was 300.300. He decides to predict her ﬁnal‑exam score from her pre‑exam total. © Macmillan Learning (a) What is the slope of the least-squares regression line of final-exam scores on pre-exam total scores in this course? Give your answer to one decimal place. slope: What is the intercept? Give your answer as a whole number. intercept:
A quantity measured 50 times results in a mean x=23.345 +/- 0.0022 What is the standard deviation? What number of measurements will cut the standard deviation of the mean half? If a 100 measurement are taken, what is the new standard deviation?
The arithmetic mean and standard deviation of a series of 20 items were calculated by á/ student as 20 cm and 5 cm. respectively. But while calculating them an item 13 was misread as 30. Find the correct arithmetic mean and standard deviation.