The following table shows the relative percent distribution for the time in seconds that it took 200 children with attention deficit disorder (ADD) to show symptoms of the disorder after a manipulation.

Time (in seconds) _____________________ Relative Percent

1-6 ......................................................... 5%

7-12 ........................................................ 5%

13-18 ......................................................20%

19-24 ......................................................20%

25-30 ......................................................30%

31-36 ......................................................20%

Assume that researchers determined that children who showed symptoms of ADD in 18 seconds or less qualified to participate in a new cognitive behavioral therapy trial thought to help reduce ADD symptoms. How many children qualify for this new treatment? First convert the data to a cumulative frequency distribution.