<image>In a knowledge contest titled "I Love My Country" organized by a school, the number of participants from each class is the same. The grades are divided into four levels: A, B, C, and D, with corresponding scores of 100, 90, 80, and 70 respectively. The school has compiled and charted the results of Class 1 and Class 2 of the eighth grade as follows:

Based on the information provided, please answer the following questions:
(1) Find the number of people in Class 2 whose scores are above or equal to grade C.
(2) Complete the table:
\frac{}(3) Based on the table above, analyze the results of this contest from different perspectives and compare the performance of Class 1 and Class 2. (Write at least two points)