The following chart shows how the percentage of eighth graders, tenth graders, and twelfth graders who have used marijuana in their lifetime has varied in recent years.

(a) Find the average annual rate of change in the percent of eighth graders who have used marijuana in their lifetime over the period from 2010 to 2014 and over the period from 2015 to 2019. Then calculate the annual rate of change for 2010–2019.
(b) Repeat part (a) for tenth graders.
(c) Repeat part (a) for twelfth graders.

Transcribed Image Text:

Percentage who have used marijuana 50- 45 40 35- 30 25 5 8 20- 43.8 10- 5 15-17.3. 45.5 33.4 34.5 16.4 45.2 45.5 33.8 15.2 35.8 16:5 44.4 44.7 44.5 3327 15.6 15.5 29.7 1.2;8. 12th Graders 45.0 43.6 43.7 10th Graders 30.7 13:5 32.6. 34.0 8th Graders 13.9 15.2 0 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 Year