Answer
$37.5$%
$12.5$%
Work Step by Step
Total: $17+18+7+5+0+1=48$ colleges.
The relative frequency for "0-4,999" is $\frac{17}{48}\approx0.3542$
The relative frequency for "5,000-9,999" is $\frac{18}{48}=0.3750$
The relative frequency for "10,000-14,999" is $\frac{7}{48}\approx0.1458$
The relative frequency for "15,000-19,999" is $\frac{5}{48}\approx0.1042$
The relative frequency for "20,000-24,999" is $\frac{0}{48}=0$
The relative frequency for "25,000-29,999" is $\frac{1}{48}\approx0.0208$
The percentage of colleges enrolled between 5000 and 9999 is the relative frequency of the 2nd class: $0.3750=37.5$%
The percentage of colleges enrolled 15,000 or more students is the summation of the relative frequencies of the 4th, 5th and 6th classes: $0.1042+0.0000+0.0208=0.1250=12.5$%
