Mr. Harrison is examining grades his seventh-grade students earned on a vocabulary test. The grades are: 40, 38, 50, 89, 57, 69, 77, 89, 54, 81, 77, 99, 45, 71, 77

Which of the following answers reflect the median grade? Ms. Zhong is examining grades his seventh-grade students earned on a vocabulary test. The grades are: 40, 38, 50, 89, 57, 69, 77, 89, 54, 81, 77, 99, 45, 71, 77

Which of the following answers reflects the mean? 67.5

The mean is the average of all of the grades. The average of all grades is a 67.5. The mean of a set of numbers is their average. You find the average of a set of numbers by adding them up and dividing by the number of numbers you have. So, the mean of the numbers listed is: (40, 38, 50, 89, 57, 69, 77, 89, 54, 81, 77, 99, 45, 71, 77)/15 = 67.5 ;