Twenty-five sixth-grade students were asked to estimate how many hours a week they spend talking on the phone. This dot plot represents their reported number of hours of phone usage per week. 9 10 0 1 2 3 4 5 6 7 8 hours on the phone per week.
1. How many of the students reported not talking on the phone during the week?
2. What is the largest number of hours a student spends talking on the phone per week?