Measures of Center and Variation

Find the mean of these numbers:
5,11,2,12,4,2

• 4.1
• 6
• 4.5
• 4

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

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

• 9
• 5
• 3
• 7

Find the median:
5, 6, 3, 9, 0, 4, 1, 2, 7

• 4
• 4.1
• 5
• 4.5

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

• 7
• 23
• 31
• 34

Which measure of center best represents this set of data?
12, 13, 11, 16, 31, 14, 10, 15

• Mean
• median
• mode

What measure of center is best to use when we have outliers?

• mean

• median

• mode

• range

It is possible to have three numbers in the middle of a data set.

• True
• False

What is the maximum value?

• 58
• 66
• 64
• 60

11. What percentage of the data is between 90 and 140?

• 25 %
• 50%
• 75%
• 100%