The scores on a marketing exam were normally distributed with a mean of 67 and a standard deviation of 9.  Find the first Quartile for the test scores.

The mean test score for a history test is 63 with a standard deviation of 9. The mean test score for a chemistry test is 23 with a standard deviation of 4. A student got a 66 on the history test and a 26 on the chemistry test, use Z-scores to determine the relative performance on each test. On which test did the student perform better, and why?

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.

The amount of Jen's monthly phone bill is Normally distributed with a mean of $ 76 and a standard deviation of $ 11.What percentage of her phone bills are less than $ 80?

The average chef at a restaurant earns $17 an hour with a deviation of $1.75. What are the chances that someone is earning more than $20 an hour?

The mean height of a population of men is 70.8 inches and the standard deviation is 3.2 inches. What proportion of these men can walk through 6-foot tall doorway without having to duck?

On a verbal skill test, the mean was 72 and the standard deviation was 7. If John scored 75, what was his z-score?

A line for tickets to a broadway show had a mean waiting time of 20 minutes with a statistic deviation of 5 minutes. What Percentage of People in line waited for more than 28 minutes?

According to the U.S. Census, the average adult woman is the United States is 65 inches tall and the standard deviation is 3 inches.  If Zsike is 67 inches tall, what is her z-score?

Jared has a mean of 74 on his quizzes, with a standard deviation of 7. On his most recent quiz, he scored a 65. Is this unusual compared to how he usually performs on quizzes?