A group of environmental professionals developed the graph show the reducation in carbon monoxide in country A from 1990-2007, as measured by average concentration in parts per million for 8 hours of exposure. Find the average rate of change for carbon monoxide levels for each period.
a. 1992 to 1999
b. 2004 to 2007
What is the average rate of change for carbon monoxide levels between 1992 and 1999? (Type an integer or decimal rounded to three decimal places as needed.)
