Which area had more bad air days, NY or LA?

Grade level: 3rd – 5th grades

Skills: Data Analysis(Mean,Median,Mode& Range)

Related environmental issues: Air Quality


Breathing dirty air increases your chance of developing health problems. The table below shows the number of bad air days in seven areas in the United States in 2018.

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


Note) The numbers used here are those categorized under “unhealthy air quality days for  older adults and children” in 2018.


Answer keys

1.108 (108- 0= 108)
2.28 (11+19+108+0+35+4+19)÷7= 28


Factful Environmental Math Problems (2020)

Just published and now available from Amazon  (paperback)

About this book

The objective of Factful Environmental Math Problems is to cultivate our young people’s skills to analyze and evaluate fact-based data for understanding our world, while improving their math skills and critical thinking skills.

With the rise of the Internet and new technology, building skills to analyze and evaluate fact-based data becomes increasingly important for our young people to prepare for this rapidly changing world. These skills minimize their chances of being brainwashed by false information and making uninformed decisions and ultimately help develop their critical thinking skills. (Read more)

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Published: March 26, 2020

Price: $6.25

Has the gasoline price changed over the years?

Grade level: 5th – 6th grades

Skills: Mean, mode, median and range

Related environmental issues:  Energy

The table below shows the average price of gasoline per gallon between 2013 and 2017 in the United States.  Find mean, mode, median and range.

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Sources: U.S. Energy Information Administration (2018) Retail Gasoline and Diesel Prices


Answer keys

mean: 2.6

mode: 2

median: 2

range: 2