Final answer:
To find the average percentage of users for the given years, add up all the percentages and divide by the total number of years.
Step-by-step explanation:
To find the average percentage of users for the given years, you will need to add up all the percentages and divide by the total number of years. Let's take the sample provided in the question:
YearAlcohol UseCigarette Use201520%10%201625%8%201718%12%
To calculate the average percentage of alcohol users, add up the alcohol percentages (20%, 25%, and 18%) and divide by 3 (the total number of years). Do the same for the average percentage of cigarette users.
Average Alcohol Users: (20% + 25% + 18%) / 3 = 63% / 3 = 21%
Average Cigarette Users: (10% + 8% + 12%) / 3 = 30% / 3 = 10%