An instructor gives a 100-point examination in which the grades are normally distributed with a mean...
An instructor gives a 100-point examination in which the grades
are normally distributed with a mean of 70 and a standard deviation
of 8.
(a) What proportion of students will get a score of 80 or
higher?
(b) If the instructor decides to give an A to students whose scores
rank in top 5%, what is the cutoff score?
Homework Answers
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An instructor gives a 100-point examination in which the grades
are normally distributed with a mean...
Note: Please show all work and explanations to receive a thumbs-up. Thank you! 1. (10 points)...
Note: Please show all work and explanations to receive a
thumbs-up. Thank you!
1. (10 points) An instructor gives a 100-point examination in which the grades are normally distributed with a mean of 70 and a standard deviation of 8 (a) What proportion of students will get a score of 80 or higher? (b) If the instructor decides to give an A to students whose scores rank in top 5%, what is the cutoff score?
Problem 3: Scores on an exam are assumed to be normally distributed with mean /u =...
Problem 3: Scores on an exam are assumed to be normally distributed with mean /u = 75 and variance a2 = 25 (1) What is the probability that a person taking the examination scores higher than 70? (2) Suppose that students scoring in the top 10.03% of this distribution are to receive an A grade. What is the minimum score a student must achieve to earn an A grade? (3) What must be the cutoff point for passing the examination...
Exam grades: Scores on a statistics final in a large class were normally distributed with a...
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....
Exam grades: Scores on a statistics final in a large class were normally distributed with a...
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...
Grades on a biology exam are approximately normally distributed with a mean of 78 and a...
Grades on a biology exam are approximately normally distributed with a mean of 78 and a standard deviation of 8. Originally Dr. Smith decides to curve course grades as follows: Students who score above the 90 percentile will receive an A Students whose scores are in the 80-89.percentiles receive a B Students whose scores are in the 70th-795h percentiles receive a C Students whose scores are in the 60-69 percentiles receive a D Students who score below the 60th percentile...
Exam grades: Scores on a statistics final in a large class were normally distributed with a...
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 T1-84 PLUS calculator to answer the following. Round the answers to at least two decimals. (a) Find the 47 percentile of the scores (b) Find the 65 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. What...
A set of final examination grades in an introductory statistics course is normally distributed, with a...
A set of final examination grades in an introductory statistics course is normally distributed, with a mean of 73 and a standard deviation of 7. Complete parts (a) through (d). a. What is the probability that a student scored below 86 on this exam? (Round to four decimal places as needed.) b. What is the probability that a student scored between 66 and 93? (Round to four decimal places as needed.) c. The probability is 55% that a student taking...
The scores on an economics examination are normally distributed with a mean of 74 and a...
The scores on an economics examination are normally distributed with a mean of 74 and a standard deviation of 12. If the instructor assigns a grade of A to 13% of the class, what is the lowest score a student may have and still obtain an A?
assume that IQ scores are normally distributed with a mean of 100 and a standard deviation...
assume that IQ scores are normally distributed with a mean of 100 and a standard deviation of 15 (as on the Wechsler test). If a gifted program only accepts students with IQ scores in the top 14% what is the minimum IQ score to get to be considered for the program
examination grades in an introductory statistics course is normally distributed, with a mean of 75 and...
examination grades in an introductory statistics course is normally distributed, with a mean of 75 and a standard deviation of 7. Complete parts (a) through (d) a. What is the probablity that a student scored below 87 on this exam? The probability that a shudent scored below 87 is (Round to four decimal places as needed.) b What is the probability that a student scored between 68 and 94 The probability that a student soored between 68 and 94 is...
Note: Please show all work and explanations to receive a
thumbs-up. Thank you!
1. (10 points) An instructor gives a 100-point examination in which the grades are normally distributed with a mean of 70 and a standard deviation of 8 (a) What proportion of students will get a score of 80 or higher? (b) If the instructor decides to give an A to students whose scores rank in top 5%, what is the cutoff score?
Problem 3: Scores on an exam are assumed to be normally distributed with mean /u = 75 and variance a2 = 25 (1) What is the probability that a person taking the examination scores higher than 70? (2) Suppose that students scoring in the top 10.03% of this distribution are to receive an A grade. What is the minimum score a student must achieve to earn an A grade? (3) What must be the cutoff point for passing the examination...
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....
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...
Grades on a biology exam are approximately normally distributed with a mean of 78 and a standard deviation of 8. Originally Dr. Smith decides to curve course grades as follows: Students who score above the 90 percentile will receive an A Students whose scores are in the 80-89.percentiles receive a B Students whose scores are in the 70th-795h percentiles receive a C Students whose scores are in the 60-69 percentiles receive a D Students who score below the 60th percentile...
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 T1-84 PLUS calculator to answer the following. Round the answers to at least two decimals. (a) Find the 47 percentile of the scores (b) Find the 65 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. What...
examination grades in an introductory statistics course is normally distributed, with a mean of 75 and a standard deviation of 7. Complete parts (a) through (d) a. What is the probablity that a student scored below 87 on this exam? The probability that a shudent scored below 87 is (Round to four decimal places as needed.) b What is the probability that a student scored between 68 and 94 The probability that a student soored between 68 and 94 is...
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