1. B
Robin got C because she found the sum of students that didn't plan to go to the school play.
2.
Sixth graders
No: 48.1%
Seventh graders
Yes: 45.2%
Eighth graders:
Yes: 40%
No: 60%
Yes, because the higher the grade level, the less students that planned to go to the play. It was probably because the higher grade level students have more things planned and less time to do stuff.