Grade level: 4 – 5th grades

Skills: Median, Mode, Range

Related environmental issues: Air pollution

Area level: National

Breathing dirty air increases your chance of developing health problems. The table shows the number of bad air days in a year in seven areas in the United States.

1. What is the range of the bad air days?
2. What is the median of the bad air days?
3. What is the mode of the bad air days?

Source: Aircompare, AirNow

Note) The numbers used here are the numbers categorized under “unhealthy air quality days for  older adults and children” in 2014.

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Answer keys

1. 81 (82-1=91)
2. New York, New York
3. 1