Ten sixth-grade students in five different countries—United States, Australia, South Africa, Canada, and New Zealand—were asked about their travel times to school. Their responses were organized into five data sets. The mean and MAD of each data set is shown in the table. Which group of students has the greatest variability in their travel times? Explain your reasoning.
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mean
MAD
United States 9 4.2
Australia 18.1 7.9
South Africa 23.5 16.2
Canada 11 8
New Zealand 12.3 5.5
The mean of the data set for New Zealand is close to that of Canada. What does this tell us about the travel times of students in those two data sets?

The MAD of the data set for New Zealand is quite different than that of Canada. What does this tell us about the travel times of students in those two data sets?
The data sets for Australia and Canada have very different means (18.1 and 11 minutes) but very similar MADs. What can you say about the travel times of the students in those two data sets?