Suppose an exam has an average of 82.2, with a standard deviation of 5.2. If a student has a z-score of 2, what was their exam score?
Suppose an exam has an average of 82.2, with a standard deviation of 5.2. If a...
The average score in the final exam of a course is 65 and the standard deviation is 10. a) Give an upper bound on the probability of a student scoring more than 95? b) Suppose the scores follow a normal distribution. Compute the probability of a student scoring more than 95 and compare it to the bound obtained in a)
The average score on an exam was reported as 61% with a standard deviation of 16%. You may assume exam scores are normally distributed. If I select 10 people at random, what is the probability that the average of their scores would be … (A) …more than 50%? (B) …between 70% and 85%?
A group of students take Exam the average was M = 68 and the standard deviation was SD = 8. If a student scoreda 70 on the exam, what percentage of students scored BELOW her ?
An exam is given to all senior high school students, the standard deviation for all the students is given as 30. The average score for 40 students on the exam is 250. Assume the means to be measured to any degree of accuracy (assume that scores are Gaussian distributed). (a) Find the 95% confidence interval (CI) for the average score of all students taking the exam. (b) Find the prediction interval for the score of the next student chosen at...
Suppose that scores on a statistics exam are normally distributed with a mean of 77 and a standard deviation of 4. Find the probability of a student scoring less than 80 on the exam using the following steps. (a) What region of the normal distribution are you looking to find the area of? (to the left of a zscore, to the right of a z-score, between two z-scores, or to the left of one z-score and to the right of...
An exam is given to all senior high school students, the standard deviation for all the students is given as 30. The average score for 40 students on the exam is 250. Assume the means to be measured to any degree of accuracy (assume that scores are Gaussian distributed). (a) Find the 95% confidence interval (CI) for the average score of all students taking the exam. (b) Find the prediction interval for the score of the next student chosen at...
QUESTION 1 An exam is given to all senior high school students, the standard deviation for all the students is given as 30. The average score for 25 students on the exam is 440. Assume the means to be measured to any degree of accuracy (assume that scores are Gaussian distributed). (a) Find the 98% confidence interval (CI) for the average score of all students taking the exam. (b) Find the prediction interval for the score of the next student...
SORU 1 An exam is given to all senior high school students, the standard deviation for all the students is given as 30. The average score for 50 students on the exam is 540. Assume the means to be measured to any degree of accuracy assume that scores are Gaussian distributed Find the 90s confidence interval (C) for the average score of all students taking the exam, Find the prediction interval for the score of the next student chosen at...
An exam is given to all senior high school students, the standard deviation for all the students is given as 30. The average score for 50 students on the exam is 540. ASS the means to be measured to any degree of accuracy (assume that scores are Gaussian distributed). (a) Find the 90% confidence interval (CI) for the average score of all students taking the exam. (b) Find the prediction interval for the score of the next student chosen at...
Example 3 The scores on a midterm exam follow a normal distribution with an average of 80.4% and a standard deviation of 10.9%. Let X represent the score of a given student on this midterm exam. 1. What is the probability that a randomly selected student scores above a 90%? 2. What is the probability that a randomly selected student scores between 80% and 90%? 3. What is the 60th percentile score for this midterm exam?