<image>Wang Hua and Zhang Wei, two classmates in ninth grade, have their scores for 10 math unit self-assessments (all scores are whole numbers, and the units digit is 0) shown below in the figure: .

1. Based on the data provided in the figure, complete the table: \frac{   }_.
2. If scores of 90 and above (including 90) are considered excellent, then the student with the higher excellence rate is ________.
3. If you need to choose one of these two students to participate in a math competition, can you give some suggestions to the teacher?