On a test of physical fitness, 18-year-olds' scores are normally distributed
with a mean of 140 and a standard deviation of 25.
Approximately what percentage of 18-year-olds have scores above
190? Below 165? Below 115?
Use the normal curve approximation rules.
On a test of physical fitness, 18-year-olds' scores are normally distributed with a mean of 140...
The scores on a lab test are normally distributed with mean of 200. If the standard deviation is 20, find: a) The score that is 2 standard deviations below the mean b) The percentage of scores that fall between 180 and 240 c) The percentage of scores above 240 d) The percentage of scores between 200 and 260 e) The percentage of scores below 140
Suppose that scores on a particular test are normally distributed with a mean of 140 and a standard deviation of 16. What is the minimum score needed to be in the top 20% of the scores on the test? Carry your intermediate computations to at least four decimal places, and round your answer to one decimal place.
At XYZ college, the SAT verbal test scores for first-year students are normally distributed. The mean is 590. The standard deviation is 65. Q: Sketch the normal distribution and curve using the information above. Show all values for three standard deviations to the right and the left of the mean.
1. Scores on an IQ test for the 18-to-30 age group are approximately normally distributed with a mean of 110 and a standard deviation 25. Scores for the 31-to-40 age group are approximately normally distributed with mean 100 and standard deviation 20. Phoebe, who is 25, scores 130 on the test. Amandeep, who is 36, also takes the test and scores 116. Who scored higher relative to her age group, Phoebe or Amandeep? a) Phoebe b) Amandeep c) They scored...
Assume that a set of test scores is normally distributed with a mean of 100 100 and a standard deviation of 15 15. Use the 68-95-99.7 rule to find the following quantities. a. The percentage of scores less than 100 is 50%. (Round to one decimal place as needed.) b. The percentage of scores greater than 115%. ___ (Round to one decimal place as needed.) c. The percentage of scores between 70 and 115%. ___ (Round to one decimal place...
Scores on a standardized test are normally distributed with a mean of 100 and a standard deviation of 20. If these scores are converted to standard normal Z scores, which of the following statements will be correct?
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?
Test scores on a certain test are normally distributed with a mean of 25 and a standard deviation of 5. Find the probability that the mean of a sample of 30 tests is between 27.6 and 32.4. Group of answer choices 0.2222 0.0022 0.9306 0.2321
Assume that a set of test scores is normally distributed with a mean of 100 and a standard deviation of 25. Use the 68-95-99.7 rule to find the following quantities.
Suppose scores of students on a test are approximately normally distributed with a mean score of 65 points and a standard deviation of 8 points. It is decided to give A's to 10 percent of the students. Obtain the threshold score that will result in an A.