Question

The Environmental Protection Agency (EPA) monitors air quality in various areas around the country. It uses an Air Quality Index to report conditions on a scale of 1 to 200. Based on its December database, the EPA published index values (covering 273 days of observation) for the Los Angeles-Long Beach area of California:
a. Draw the frequency histogram for the data.
b. Use the grouped data table to approximate the mean, the variance and the standard deviation of the air quality index values.


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  • CreatedJuly 16, 2015
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