We have to calculate the proportion (expressed in percentage) of students who do not play sports and play a musical instruments.
We can calculate this proportion as the quotient between the students who do not play sports and play a musical instruments (7 students) and the total numer of the students in the survey (we have to add all the categories):
![p=(7)/(6+7+8+3)=(7)/(24)\approx0.2917\approx29\%](https://img.qammunity.org/2023/formulas/mathematics/college/xqsys4od1umg4ceufi23fyq1qeyvujbcag.png)
We can approximate this percentage to 30%.
Answer: 30%