Declining Number of Those Who Smoke. Daily use of cigarettes by U.S. 12th graders is declining. In 1995, 21.6% of 12th graders smoked daily. This number had decreased to 9.3% in 2012.(Source: Monitoring the Future, University of Michigan Institute for Social Research and National Institute on Drug Abuse) Find the average rate of change in the percent of 12th graders who smoke daily from 1995 to 2012.
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