1. Convert the dates to the number of days since January 1st:
- September 3rd: (31 + 28 + 31 + 30 + 31 + 30 + 3) = 247 days
- June 15th: (31 + 28 + 31 + 30 + 31 + 15) = 166 days
2. Find the difference between the number of days:
- Difference = 247 days - 166 days = 81 days
3. Divide the difference by 2 to find the midpoint:
- Midpoint = 81 days / 2 = 40.5 days
4. Add the midpoint to January 1st to find the date:
- Midpoint date = January 1st + 40.5 days
- January 1st + 40 days = February 9th (approximately)
5. Estimate the average age of students:
- Assuming students are between 14 and 18 years old:
- Average age = (14 + 18) / 2 = 16 years old (approximately)
Therefore, the average age of students at Springfield High School on the first day of school (September 3rd) and last June 15th is approximately 16 years old.