Mean

9.2 Mean

Chapter 9: Statistical Measures

Key Vocabulary

Mean: the sum of the data divided
by the number of data values,
average average

Math Response

Find the mean of the data set:

Emails sent in the last 4 hours: 2, 5, 4, 5

Type answer here

Correct Answer: 4

Deg^°

Rad

Math Response

Find the mean of the data set:

Magazine subscriptions sold this week: 3, 6, 7, 6, 7, 9, 11

Type answer here

Correct Answer: 7

Deg^°

Rad

Math Response

Find the mean of the data set:

Type answer here

Correct Answer: 2.6

Deg^°

Rad

Math Response

The table shows the number of points scored by your team in each quarter of a football game. What is the mean number of points scored in a quarter?

Type answer here

Correct Answer: 6.75

Deg^°

Rad

Key Vocabulary

Outlier: a data value that is much
greater or much less than the other
values. When included in a data
set, it can affect the mean.

Math Response

Identify the outlier:

Weights (in pounds) of dogs at a kennel: 48, 50, 55, 60, 8, 37, 50

Type answer here

Correct Answer: 8

Deg^°

Rad

Math Response

Find the mean with the outlier:

Weights (in pounds) of dogs at a kennel: 48, 50, 55, 60, 8, 37, 50

Type answer here

Correct Answer: 44

Deg^°

Rad

Math Response

Find the mean WITHOUT the outlier:

Weights (in pounds) of dogs at a kennel: 48, 50, 55, 60, 8, 37, 50

Type answer here

Correct Answer: 50

Deg^°

Rad

Open Ended

Describe how the outlier affects the mean.

Here is the data listed from least to greatest: 8, 37, 48, 50, 50, 55, 60

Mean with outlier: 44

Mean WITHOUT outlier: 50