1. The problem asks for the mode of the ages of campers present on the 1st day of camp. 2. The mode is the value that appears most frequently in a data set. 3. From the table, the total campers by age are: - 13 years: 21 campers - 14 years: 29 campers - 15 years: 30 campers 4. Comparing these totals, the highest number is 30 campers at age 15. 5. Therefore, the mode of the ages is 15. **Final answer:** 15