Measures of Dispersion

This lecture series discusses measures of dispersion (interquartile range, variance, and standard deviation). Watch these videos and complete the interactive exercises.

Practice

Interquartile range (IQR) - Questions

1. The following data points represent the number of hours each of the staff members at Daniel's Department Store slept Thanksgiving night.

Sort the data from least to greatest.

Find the interquartile range (IQR) of the data set.

______ hours

2. The following data points represent the number of animal crackers in each kid's lunch box.

Sort the data from least to greatest.

Find the interquartile range (IQR) of the data set.

______ animal crackers

3. Find the interquartile range (IQR) of the data in the dot plot below.

______ players

4. The following data points represent the number of remote controllers each student in Tria's video game club owns.

Sort the data from least to greatest.

Find the interquartile range (IQR) of the data set.

_______ remote controllers