Adam wants to observe the amounts of time the students in his middle school spend listening to music every day. For this, he surveys 40 seventh graders in his school. Is the survey sample a valid representation of the entire school, and why?

No. Adam does not survey members of the school band.

No. Adam does not survey students from other grades.

Yes. Adam samples a large group and has a good representation of the school.

Yes. Adam surveys all seventh graders.