Answer:
30%
Explanation:
Age No. of volunteers
10-14 3
15-19 2
20-24 7
25-29 8
30-34 5
35-39 5
Total no. of volunteers = 3+2+7+8+5+5 =30
Now we are supposed to find What percent of the volunteers was at least 15 years old but no more than 24 years old
15-19 2
20-24 7
So, total no. of volunteers was at least 15 years old but no more than 24 years old = 7+2=9
So, percentage of volunteers was at least 15 years old but no more than 24 years old:
=

=

Hence 30 % of volunteers was t least 15 years old but no more than 24 years old.