Given:
The percentage of age group smoking Marijuana is,
18-29 years = 22%
30-49 years = 11%
Over 65 = 3%
For the age group 30-49,
[tex]\begin{gathered} 11\text{ \% of 470 people smoke Marijuana} \\ \frac{11}{100}\times470=51.7\approx52 \\ \text{The number of people dont smoke Marijuana is, } \\ 470-52=418 \end{gathered}[/tex]
Total people smoke Marijuana is,
[tex]114+52+38+14=218[/tex]
Total people don't smoke Marijuana is,
[tex]403+418+281+463=1565[/tex]
Total people,
[tex]517+470+319+477=1783[/tex]
The percentage of people who smoke Marijuana in the age group 50-64 is,
[tex]\begin{gathered} a\text{ \% of 319=38} \\ \frac{a}{100}\times319=38 \\ a=38\times\frac{100}{319} \\ a=11.91 \\ a\approx12\text{ \%} \end{gathered}[/tex]
The percentage of people in the age group 50-64 who smoke Marijuana is,
[tex]a\text{ \% of 1783=319}[/tex]
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