Effects on Measure of Center

What happens if 25 is added to the following data set?

75, 87, 99, 73,

• the mode increase

• the mean increases

• the mean decreases

• the median increases

What happens if 45 is removed from the data set?

35, 45, 22, 32, 43, 45, 45

• the mode will decrease

• the mode will stay the same

• the mean will increase

What will happen to the median if a 8 is added to the data set?

8, 2, 5, 9, 8

• the median will increase

• the median will decrease

• the median will stay the same

What happens to the mode if 98 is removed from the data set?

100, 102, 36, 98, 99, 98, 100

• there will be no mode

• the mode will be 98

• the mode will be 98 and 100

• the mode will be 100

Find the mean:
28, 18, 19, 18, 17

• 20
• 18
• 11
• 19

Find the mode:
5, 0, 9, 9, 3, 0, 5, 5, 4

• 9
• 5
• 3
• 7

Can there be more than one mode?

• Yes
• No

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

The data set below has an outlier of 42.
2, 5, 12, 15, 19, 4, 6, 11, 16, 18, 12, 12, 42
What effect does removing the outlier have on the distribution of the data?

• The mean will decrease

• The median will decrease

• The mean will increase

• The median will increase

Identify the outlier for the given data?
23, 34, 27, 7, 30, 26, 28, 31, 34

• 7

• 23

• 31

• 34