Answer
$\frac{2}{5}$ responded 4 hours or more,
408 responded 4 hours or more,
Work Step by Step
To find the fraction of people and the number of people willing to wait four hours or more you must combine the group who responded 4 hours with the group who responded 8 hours or more.
The graph indicates the $\frac{1}{4}$ responded 8 hours or more and $\frac{3}{20}$ responded 4 hours. To add these fractions together you must find the lowest common denominator and restate both fractions using the lowest common denominator. The lowest common denominator is 20, so only $\frac{1}{4}$ needs to be converted.
$\frac{1}{4}$ = $\frac{1 \times 5}{4 \times 5}$ = $\frac{5}{20}$
Now you can add the two fractions to find the fraction of people who responded 4 hours or more.
$\frac{5}{20}$ + $\frac{3}{20}$ = $\frac{8}{20}$ = $\frac{8 \div 4}{20 \div 4}$ = $\frac{2}{5}$
Multiply the total number people of surveyed by $\frac{2}{5}$ to find the number who responded 4 hours or more.
$1020 \times \frac{2}{5}$ = $\frac{2040}{5}$ = $\frac{2040 \div 5}{5 \div 5}$ = $\frac{408}{1}$ = 408
