7. (3 points) In a class of 30 people participating in a jump rope competition, at the beginning, 4 people were late and did not participate in the competition, at which point the average score was 20. Later, these 4 students arrived at the competition venue and jumped $26, 27, 28, 29$ times respectively. At this point, the average score of the entire class is $\qquad$ times.
7. (3 points) In a class of 30 people participating in a jump rope competition, at the beginning, 4 people were late and did not participate in the competition, at which time the average score was 20. Later, these 4 students arrived at the competition venue and jumped $26, 27, 28, 29$ times respectively. At this point, the average score of the entire class is $\qquad$ 21.

【Analysis】According to 30 people participating in the jump rope competition, at the beginning, 4 people were late and did not participate in the competition, at which time the average score was 20. First, calculate the scores of $30-4=26$ people, $(30-4) \times 20=520$, then add $26, 27, 28, 29$, and finally divide by 30 to solve the problem.

【Solution】Solution: $(30-4) \times 20=520$ (times)
$520+26+27+28+29=630$ (times)
$630 \div 30=21$ (times)
Answer: At this point, the average score of the entire class is 21 times.
Therefore, the answer is: 21.
【Comment】This problem examines the meaning and application of the average number.