Answer
See the picture.
Work Step by Step
Total: $412+181+412=1005$ adult Americans.
The relative frequency for "New tolls" is $\frac{412}{1005}\approx0.4100$
The relative frequency for "Increase gas tax" is $\frac{181}{1005}\approx0.1801$
The relative frequency for "No new roads" is $\frac{412}{1005}\approx0.4100$
