The monthly starting salaries of students who receive an MBA degree have a population standard deviation of $110. What sample size should be selected to obtain a 0.95 probability of estimating the population mean monthly income within a margin of $20?

The sample standard deviation is a measure of what?

High school students across the nation compete in a financial capability challenge each year by taking a National Financial Capability Challenge exam, students who score in the top 19 percent are recognized publicly for their achievement by the Department of Treasury.  Assuming a normal distribution, how many standard deviations above the mean does a student have to score to be recognized?

On the PSAT test taken by about 1.5 million high school juniors each year, the mean score on the reading portion of the test was 46.9, with a standard deviation of 10.9. The scores are normally distributed. If a student needed a score on this portion of the test that put them in the top 5% of scores nationally to qualify for a particular scholarship, what is the minimum score they must achieve?

The typical amount of sleep per night for college graduate students has a normal distribution with a mean of 5 hours. What is the standard deviation of this distribution if ​16% of students sleep more than 6.5​ hours?   A. ​-1.52   B. ​-1.55   C. 1.52   D. 1.55

Entrance exam scores at Cititon University are normally distributed with a mean of 552 and a standard deviation of 29. If scholarships are awarded to the top 10% of scores, what is the minimum score needed to guarantee a scholarship?

What is the equation for The standard deviation of the distribution of sample means

The admission committee of AUCA passes 33% of those who took the exam. If the scores follow a normal distribution with a mean of 85 and a standard deviation of 9, what is the passing score?

a mathematics assessment test has a mean score of 100 points with a standard deviation of 10 points. what does a person have to be in the top 2.5% of people who have completed the exam? (Assume a normal distribution).