Answer
See the picture.
Work Step by Step
$Cumulative~relative~frequency=\frac{cumulative~frequency}{sum~of~all~frequencies}$
Total (sum of all frequencies): $21+18+7+3+1+0+1=51$.
Cumulative relative frequency for "30,000-35,999" is $\frac{21}{51}\approx0.4118$
Cumulative relative frequency for "36,000-41,999" is $\frac{39}{51}\approx0.7647$
Cumulative relative frequency for "42,000-47,999" is $\frac{46}{51}\approx0.9020$
Cumulative relative frequency for "48,000-53,999" is $\frac{49}{51}\approx0.9608$
Cumulative relative frequency for "54,000-59,999" is $\frac{50}{51}\approx0.9804$
Cumulative relative frequency for "60,000-65,999" is $\frac{50}{51}\approx0.9804$
Cumulative relative frequency for "66,000-71,999" is $\frac{51}{51}=1$
