Mean and Median

Find the average of these numbers.

• 5

• 4

• 10

• 3

What is the average of these numbers?

2, 6, 4, 8, 5

• 8

• 2

• 5

• 7

When finding the median, what do you do if there are two middle numbers?

• Add them together and divide by 2

• Write them both as the answer

• Give up

• Pick one

Find the median:
3, 5, 7, 4, 3, 1

• 3 and 4

• There isn't one

• 3.5

• 3

• 87
• 87.05
• 88.05
• 88

These data show the ages of students in a community play: 12, 9, 11, 9, 15, 11, 9, 11, 12. Which data point could be removed from the set without changing the mean or the median of the data?

• 9

• 11

• 12

• 15

Answer explanation

Removing the data point '9' will not change the mean or median as it appears multiple times in the set, thus not affecting the central tendencies.

A. The student saw that this will not change the median.

B. Correct. The student demonstrated an ability to describe the impact that deleting a data point has on the mean and

the median of a data set.

C. The student saw that this will not change the median.

D. The student saw that this will not change the median.

Tags

PA.D.1.1

• A
• B
• C
• D

The mean of this data set is 17.8. What would happen to the mean if 40 was added to the data set?

• The mean would not change

• The mean would go up

• The mean would go down

The number of points in the first five games of the football season are listed below. What is the mean number of points scored?

• 33

• 31.6

• 26

• 19