To celebrate the 90th anniversary of the founding of the Communist Party of China (CPC), a middle school launched the activity of "reciting red poems", and Class 1, Grade 9 held an election in the cla

To celebrate the 90th anniversary of the founding of the Communist Party of China (CPC), a middle school launched the activity of "reciting red poems", and Class 1, Grade 9 held an election in the class to select students to participate in this activity. Solution: (1)30÷50%=60 (person)

Nine years * * * class of 60 people;

(2) The number of "Class C" students is 60× 15%=9 (people),

The number of people with grade "D" is 60-3-30-9= 18 (people).

The complete statistical chart of broken lines is as follows:

(3) 108 ;

(4) × 100%=5%,

The excellent rate of this class is 5%.