Drug Use The chart on the next page shows how the percent of eight graders, tenth graders and twelfth graders who have used marijuana in their lifetime has varied in recent years.
Source: The Monitoring the Future Study.
a. Find the average annual rate of change in the percent of eight graders who have used marijuana in their lifetime over the four year period
b. Repeat part a for tenth graders.
c. Repeat part a for twelfth graders.
d. Discuss any similarities and difference between your answer to parts a through c, as well as possible reasons for these differences and similarities.
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