Unit 8 Lesson 1

Lesson 1:
Measures of Center

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​Previewing Unit 8

Vocabulary

Mean: A measure of center computed by adding the data values and then dividing by the number of data values in the data set.

Median: The value appearing at the center of a sorted version of the list of data.

Mode: The data value that is repeated the most in a data set.

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Which is appropriate?

​Effect of Outliers

Mean is a great measure of center, but it can be overly effected by very large or small numbers, which are called "outliers".
When outliers are involved, median is a more appropriate measure of center.
Mode is useful in a different way, finding the most frequently repeated data value.

Multiple Choice

Mr. Nesmith is reviewing the data from a recent math test. All of the students scored between 65 and 90.

Which measure of center would be best for Mr. Nesmith to use?

• Mean

• Median

• Mode

Multiple Choice

Mr. Nesmith is reviewing the data from another recent math test. This time, most of the students scored in the 70's and 80's, but a few students made low 40's.

Which measure of center would be best for Mr. Nesmith to use?

• Mean

• Median

• Mode

Multiple Choice

Mr. Nesmith is reviewing the data from a third recent math test.

He is trying to determine which question(s) he should go back over.

Which measure of center should he choose?

• Mean

• Median

• Mode