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.

Fill in the Blanks

Find the mean of the following data set.

Round your answer to the nearest tenth.

Fill in the Blanks

Find the mean of the following data set.

Round your answer to the nearest tenth.

Fill in the Blanks

Find the median of the following data set.

Fill in the Blanks

Find the median of the following data set.

Fill in the Blanks

Find the mode of the following data set.

Fill in the Blanks

Find the mode of the following data set.

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