Measures of Center of Variability

The data below represents the number of times in one week that each of 12 students visited the school library. 0,0,0,1,1,2,3,3,3,3,4,4

Which statement is true?

• The value of 0 is an outlier

• The mode is the same as the range

• All of the data values fall within a range of 3 times per week

• The mean is 2

A fitness instructor tested the arm strength of members of a fitness class to compare their scores to the national average. The test rated members on a scale from 1, the weakest, to 10, the strongest. The scores of 9 members are shown in the data set below.

4, 6, 6, 7, 7, 8, 8, 8, 9

What is the value of the median?

• 7

• 9

• 5

• 8

A fitness instructor tested the arm strength of members of a fitness class to compare their scores to the national average. The test rated members on a scale from 1, the weakest, to 10, the strongest. The scores of 9 members are shown in the data set below.

4, 6, 6, 7, 7, 8, 8, 8, 9

What is the value of the mode?

• 7

• 9

• 5

• 8

A fitness instructor tested the arm strength of members of a fitness class to compare their scores to the national average. The test rated members on a scale from 1, the weakest, to 10, the strongest. The scores of 9 members are shown in the data set below.

4, 6, 6, 7, 7, 8, 8, 8, 9

What is the value of the range?

• 7

• 9

• 5

• 8

A fitness instructor tested the arm strength of members of a fitness class to compare their scores to the national average. The test rated members on a scale from 1, the weakest, to 10, the strongest. The scores of 9 members are shown in the data set below.

4, 6, 6, 7, 7, 8, 8, 8, 9

What is the value of the mean?

• 7

• 9

• 5

• 8

Which distribution does the data show?

• Skewed Right

• Skewed Left

• Symmetrical

Which distribution does the data show?

• Skewed Right

• Skewed Left

• Symmetrical

Which distribution does the data show?

• Skewed Right

• Skewed Left

• Symmetrical

A cable company surveyed subscribers in two different areas regarding the number of hours per week they spent watching cable TV. The results are shown in the table.

Choose true or false for this statement.

Of the subscribers who were surveyed, at least 50% spent 2 hours or more per week watching cable TV.

• True

• False

A cable company surveyed subscribers in two different areas regarding the number of hours per week they spent watching cable TV. The results are shown in the table.

Choose true or false for this statement.

The data for Area A are less concentrated around the mean than the data for Area B

• True

• False