Final answer:
To find the percentage of racers who did not complete the marathon, add the number of racers who gave up and were disqualified. Divide this sum by the total number of racers and multiply by 100 to get the percentage.
Step-by-step explanation:
To find the percentage of racers who did not complete the marathon, we need to add the number of racers who gave up and were disqualified. In this case, there were 19 racers who gave up and 3 racers who were disqualified. So, the total number of racers who did not complete the marathon is 19 + 3 = 22. To calculate the percentage, divide the number of racers who did not complete by the total number of racers and multiply by 100.
Percentage of racers who did not complete = (22 / 330) * 100 = 6.7%
Therefore, the percentage of racers who did not complete the marathon is 6.7%.