FST Chapter 3 Review

The numbers represent a student's first semester exam scores:

89, 91, 65, 80, 65

What is the mean of the data?

• 78

• 80

• 90

• 65

The numbers represent a student's first semester exam scores:

89, 91, 65, 80, 65

What is the median of the data?

• 78

• 80

• 90

• 65

The numbers represent a student's first semester exam scores:

89, 91, 65, 80, 65

What is the mode of the data?

• 78

• 80

• 90

• 65

The numbers represent a student's first semester exam scores:

89, 91, 65, 80, 65

If the student wants to have an average of 80% by the end of the semester, what score do they need for their 6th exam in order to achieve their goal?

• 78

• 80

• 90

• 65

What is the variance (σ²) and standard deviation (σ) for the data?

20, 8, 16, 12, 34

• σ² = 400; σ = 20

• σ² = 18; σ = 4.2

• σ² = 90; σ = 9.5

• σ² = 80; σ = 8.9

What is the variance (σ²) and standard deviation (σ) for the data?

9, 3, 6, 2, 0

• σ² = 10; σ = 3.2

• σ² = 20; σ = 4.5

• σ² = 4; σ = 2

• σ² = 5; σ = 2.2

Eighty people were surveyed about the number of minutes they spend in traffic on a weekly basis.

What percentage of people spend more than 40 minutes in traffic weekly?

• 40%

• 2.3%

• 97.7%

• 15.9%

Eighty people were surveyed about the number of minutes they spend in traffic on a weekly basis.

What percentage of people spend no more than 35 minutes in traffic weekly?

• 63.6%

• 35%

• 28%

• 84.1%

Eighty people were surveyed about the number of minutes they spend in traffic on a weekly basis.

What percentage of people spend at least 15 minutes in traffic weekly?

• 99.9%

• 15%

• 12%

• 84.1%

Eighty people were surveyed about the number of minutes they spend in traffic on a weekly basis.

Approximately how many people spend more than 25 minutes in traffic weekly?

• 67 people

• 84 people

• 40 people

• 68 people