Median Cookies
1. The problem asks to find the median number of cookies made by 21 people based on the frequency table.
2. The frequency table is:
| Number of cookies made | Frequency |
|-----------------------|-----------|
| 10 | 1 |
| 11 | 7 |
| 12 | 2 |
| 13 | 5 |
| 14 | 4 |
| 15 | 2 |
3. The total number of people is 21, which is odd, so the median is the value at position $\frac{21+1}{2} = 11$ in the ordered data.
4. To find the 11th value, list the cumulative frequencies:
- Up to 10: 1 person
- Up to 11: 1 + 7 = 8 people
- Up to 12: 8 + 2 = 10 people
- Up to 13: 10 + 5 = 15 people
5. The 11th person falls in the group with 13 cookies because cumulative frequency reaches 15 at 13.
6. Therefore, the median number of cookies made is $\boxed{13}$.