We want to evaluate the probability that,
a student selected at random prefers to play tag at recess. That can be written as;
[tex]Pr(\text{Tag)}=\frac{No.\text{ of students who chose tag}}{Total\text{ number of students surveyed}}[/tex]The number of students who chose tag is 9.
The total number of students surveyed is 40.
Therefore,
[tex]Pr(\text{Tag)}=\frac{9}{40}[/tex]Thus, the probability that, a student selected at random prefers to play tag at recess is 9/40