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) - Answers

1. In summary,

The data from least to greatest is:

2.6,3,4.9,5,5,6,6,7.9,8,8.2

The interquartile range is 3 hours.

2. In summary,

The data from least to greatest is:

4,4,6,7,10,11,12,14,15

The interquartile range is 8 animal crackers.

3. 3.5

4. In summary,

The data from least to greatest is:

0,0,0,1,2,2,4,5,7,8,10

The interquartile range is 7 remote controllers.