A math test has a mean of 80 and a standard deviation of 8 points. Assume...
On a nationwide math test, the mean was 69 and the standard deviation was 7. If Roberto scored 85, what was his z-score?
Math 100 test scores are normally distributed with a mean of 75 and a standard deviation of 7: a) Find the probability that a grade is between 65 and 80 b) Find the grade that is the 30th percentile
Math 132 final exam grade is normally distributed with mean 68 and standard deviation 23. Final exam score above 92 corresponds to an A. Approximately what percent of the class got an A? 85% 15% 16% 84%
A final exam in Math 160 has a mean of 73 with standard deviation 7.73. Assume that a random sample of 24 students is selected and the test score of the sample is computed. Assuming the scores are normally distributed, what percentage of sample means are less than 69?
A test of reading ability has mean 60 and standard deviation 5 when given to third graders. Sixth graders have mean score 83 and standard deviation 11 on the same test. To provide separate "norms" for each grade, we want scores in each grade to have mean 100 and standard deviation 20. (Round your answers to two decimal places.) (a) What linear transformation will change third-grade scores x into new scores xnew = a + bx that have the desired...
8. The average grade on a Math test is 83 with a standard deviation of 5. The grades follow the Normal distribution. if the instructor assigns A's to the highest Q%, what is the lowest grade that will be assigned A? We were unable to transcribe this imageWe were unable to transcribe this imageWe were unable to transcribe this image56 12. The health of employees is monitored by periodically weighting them. A sample of 64 employees has a mean weight...
Assume that scores on a math competition are normally distributed a mean of 12 points and a standard deviation of 2.5 points. Answer the following questions on these scores How many students scored less than 9 points? Round to the nearest percent. How many students scored at least 17 points? Round to the nearest percent. How many students have a score between 12 and 15 points? Round to the nearest percent. What is the cuttoff score for top 5% students....
A test has a mean of 81 and a Standard Deviation of 8. What percentage of cases falls above a score of 77? Below a score of 93?
assume that the mean of a distribution of test score is 400, with a standard deviation of 45. What would be the value of the score that falls two standard deviations above the mean?
assume that the mean of a distribution of test score is 400, with a standard deviation of 45. What would be the value of the score that falls two standard deviations above the mean?