Measures of Variability

Which is NOT a measure of variability?

• Mean

• Range

• Standard deviation

• Variance

If the values in an ungrouped data are identical, what is the standard deviation?

Below are the grades of Student A in five different subjects for the first semester.

What is the range of Student A's grades?

Below are the grades of Student B in five different subjects for the first semester.

What is the mean grade of Student B?

Below are the grades of Student C in five different subjects for the first semester.

What is the sample variance of the grades of Student C?

Below are the grades of Student A in five different subjects for the first semester.

What is the sample standard deviation of Student A's grades?

Below are the grades of three students in five different subjects for the first semester.

Who among the three students showed the most consistent performance?

•  Student A

•  Student B

•  Student C

• Cannot be determined

Below are the grades of three students in five different subjects for the first semester.

Who among the three students showed the most varied performance?

•  Student A

•  Student B

•  Student C

• Cannot be determined

How many students were considered in the given grouped data?

What is the class mark of the interval, 11-15?