. The professor of a large class decides to grade the nal exam on a curve. He will use the
following criteria:
15% of students will get a grade of A+
.17% of students will get a grade of A.
11% of students will get a grade of B+
18% of students will get a grade of B.
9% of students will get a grade of C+
12% of students will get a grade of C.
10% of students will get a grade of D.
8% of students will get a grade of F.
Scores on the exam are known to follow a normal distribution with mean 67 and standard
deviation 11. What is the minimum score required to obtain a grade of C?
C grades are lies between 19th percentile and 30th percentile
Z- score of 19th percentile is
Minimum score is
. The professor of a large class decides to grade the nal exam on a curve....
show all steps, thanks 3.2.21. A professor in a large statistics class has a grading policy such that only the 15% of the students with the highest scores will receive the grade A. The mean score for this class is 72 with a standard deviation of 6. Assuming that all the grades for this class follow a normal probability distribution, what is the minimum score that a student in this class has to get to receive an A grade?
Students in a large college class took an exam and did poorly. The mean of the scores for the dass was 52 (out of 100), and the standard deviation was 11. The professor felt that the test may have been too difficult and decided to adjust the scores. She multiplied each test score by 1.3 and then added 7 to get the adjusted score. In other words, to obtain the adjusted score y from the original score x, she used...
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Exam grades: Scores on a statistics final in a large class were normally distributed with a mean of 78 and a standard deviation of 7. Use the TI-84 PLUS calculator to answer the following. Round the answers to at least two decimals. (a) Find the 34" percentile of the scores. (b) Find the 68th percentile of the scores. (C) The instructor wants to give an A to the students whose scores were in the top 11% of the class. What...
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please help me do this Final exam scores in a Math class with large number of students have mean 151 and standard deviation 4.1. Provided the scores of this Final exam have a nearly symmetric/bell-curve distribution, what percent of students score below 142.8 OR above 146.9 cal Enter a Points possible: 5 Unlimited attempts. Score on last attempt: 0. Score in gradebook: 0 Message instructor about this question more License
What's my grade? In Professor Krugman'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 280 and standard deviation 8. Professor Krugman has lost Julie's final exam but knows that her total before the exam was 300. He decides to predict her final-exam score from her pre-exam total. What is the slope of the least-square regression line of final-exam...
Exam grades: Scores on a statistics final in a large class were normally distributed with a mean of 71 and a standard deviation of 8. Use the TI-84 PLUS calculator to answer the following. Round the answers to at least two decimals. ol. (a) Find the 47th percentile of the scores. (b) Find the 65th percentile of the scores. (c) The instructor wants to give an A to the students whose scores were in the top 12% of the class....