Comparing Mean and Median

Some of Mrs. Turay’s eighth graders took the PSAT test. Score totals of ten of her students are below. Calculate the mean and the median, and determine which provides a better view of the score data. Scores: 60, 62, 67, 69, 70, 70, 71, 75, 76, 120 What is the mean test score?

• 68.9

• 70

• 74

• 82.2

Some of Mrs. Turay’s eighth graders took the PSAT test. Score totals of ten of her students are below. Calculate the mean and the median, and determine which provides a better view of the score data. Scores: 60, 62, 67, 69, 70, 70, 71, 75, 76, 120 What is the median test score?

• 70

• 71

• 81

• 81.5

Some of Mrs. Turay’s eighth graders took the PSAT test. Score totals of ten of her students are below. Calculate the mean and the median, and determine which provides a better view of the score data. Scores: 60, 62, 67, 69, 70, 70, 71, 75, 76, 120 Which measure of center best represents the test data?

• mean

• median

• both mean and median

• neither mean and median

Derrick needs to figure out how he’s doing on his test scores so far this year. You can help by calculating the mean and the median to get an overall picture of his scores. Below are all of his scores: Which measure of center best represents the test data?

• mean

• median

• both mean and median

• neither mean and median

What is the MEDIAN of this data?

• 65

• 40

• 915

• 13

Derrick needs to figure out how he’s doing on his test scores so far this year. You can help by calculating the mean and the median to get an overall picture of his scores. Below are all of his scores: What is Derrick’s mean test score so far?

• 79

• 74.4

• 81.5

• 85

Derrick needs to figure out how he’s doing on his test scores so far this year. You can help by calculating the mean and the median to get an overall picture of his scores. Below are all of his scores: What is Derrick’s median test score so far?

• 75.4

• 78

• 81.5

• 85

Mariela earned the following test scores in math:95, 90, 100, 85, 80Mr. Adams accidentally entered Mariela’s next test score as 0. Which of these statements are true? Check all that apply.

• Before the error, the mean and the median were both 90.

• Before the error, the mean was 90 and the median was 100.

• After the error, the median remained the same.

• After the error, the mean was 75 and the median was 87.5.

• The error added an outlier to the data set.

The dot plots show how much time, in minutes, students in a class took to complete each of five different tasks. Select all the dot plots of tasks for which the mean time is approximately equal to the median time.

• Dot plot A

• Dot plot B

• Dot plot C

• Dot plot D

• Dot plot E

Here is a dot plot that shows the ages of teachers at a school. Which of these statements is true of the data set shown in the dot plot?

• The mean is less than the median.

• The mean is approximately equal to the median.

• The mean is greater than the median.

• The mean cannot be determined.