Answer:
6.
Given,
Mean = 500
Standard deviation = 60
P(X < x) = 0.75
P((x-u)/s < (x - 500)/60) = 0.75
since from standard normal table
z = 0.6745
(x - 500)/60 = 0.6745
x - 500 = 0.6745*60
x = 540.4694
Option D
7.
Given,
Mean = 500
Standard deviation = 60
z = (x - u)/s
= (450 - 500)/60
= -50/60
= - 0.8333
Option B
6. In 2007 the scores on the College Aptitude Test (C. A.T.) were distributed normally with...
1. The scores on a nationwide aptitude test are normally distributed, with a mean of 80 and a standard deviation of 12. (convert raw score to z score) a. What percentage of aptitude scores are below a score of 65?
Suppose that the scores on a mathem atics aptitude test are normally distributed. If the test results have a mean score of 84 points and a standard deviation of 10.2 points, w hat is the probability that a student from this population scored 89 points or higher on this particular test? (Hint: first compute the Z score.)
5. (20 pts) Suppose that the scores on a mathematics aptitude test are normally distributed. If the test results have a mean score of 84 points and a standard deviation of 10.2 points, what is the probability that a student from this population scored 89 points or higher on this particular test? (Hint: first compute e Z-score.)
1. 2. Scores for a common standardized college aptitude test are normally distributed with a mean of 485 and a standard deviation of 114. Randomly selected men are given a Test Prepartion Course before taking this test. Assume, for sake of argument, that the test has no effect. If 1 of the men is randomly selected, find the probability that his score is at least 536. P(X> 536) = Round to 4 decimal places. If 20 of the men are...
Scores on a standard test of mechanical aptitude are normally distributed with a mean of 72 and a s. d. of 12. If 36 subjects are randomly selected, the probability that their mean score will be at least 69 is (round to the 3rd decimal place).
Scores for a common standardized college aptitude test are normally distributed with a mean of 480 and a standard deviation of 106. Randomly selected men are given a Test Preparation Course before taking this test. Assume, for sake of argument, that the preparation course has no effect. If 1 of the men is randomly selected, find the probability that his score is at least 553.4. P(X > 553.4) = Enter your answer as a number accurate to 4 decimal places....
Scores for a common standardized college aptitude test are normally distributed with a mean of 515 and a standard deviation of 108. Randomly selected men are given a Test Preparation Course before taking this test. Assume, for sake of argument, that the preparation course has no effect. If 1 of the men is randomly selected, find the probability that his score is at least 554. P(X > 554) = Enter your answer as a number accurate to 4 decimal places....
Scores for a common standardized college aptitude test are normally distributed with a mean of 491 and a standard deviation of 102. Randomly selected men are given a Test Preparation Course before taking this test. Assume, for sake of argument, that the preparation course has no effect. If 1 of the men is randomly selected, find the probability that his score is at least 555.6. P(X > 555.6) = Enter your answer as a number accurate to 4 decimal places....
Look at image, thank you. Scores for a common standardized college aptitude test are normally distributed with a mean of 510 and a standard deviation of 110. Randomly selected men are given a Test Prepartion Course before taking this test. Assume, for sake of argument, that the test has no effect. If 1 of the men is randomly selected, find the probability that his score is at least 587.8. P(X> 587.8) = Enter your answer as a number accurate to...
4. National SAT (Scholastic Aptitude Test) scores for high school students in the U.S.A. are normally distributed with a mean of 500 and a standard deviation of 116. What is the percentage of students that score (a) above 700? (C) between 650 and 800? (b) under 400? (d) within 50 of the mean?