what percentage of the population lands between the raw scores of 83 and 100? a group of students take a statistics exam where the average was m=90 and the standard deviation was SD = 7.8. answer with raw scores, z scores and what in particular you shaded when creating a curve and the final answer.

Abby's score of 704 on the math portion of the 2002 GRE exam placed her in the 84th percentile rank. The standard deviation of this exam was 141. If the test scores are normally distributed, what was the mean score of the 2002 test takers? write your answer with one decimal place.

Report the proportion you found in your physical sample as well as all the numbers you recorded from the virtual samples. Report anything you noticed about the way the graphs were shaped, how they were different as the sample size changed from 25 to 75 and how the means and standard deviations differed with the different sample size. Is a sample proportion more likely to be close to the population proportion with a larger sample size or with a smaller sample size?

On a nationwide math test, the mean was 60 and the standard deviation was 7. If Roberto scored 85, what was his z-score?