The age of some students is given in years as $12, 13, 16, 18, 14, 19, 13, 17, 15,$ and $11$. What is the **median age** (in years) of the students?

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**Solution:**

1. Arrange the ages in ascending order:
   $$11, 12, 13, 13, 14, 15, 16, 17, 18, 19$$

2. Count the total number of students: $10$ (which is an even number).

3. For an even number of observations, the median is the average of the two middle numbers.

4. The middle positions are the 5th and 6th values:
   - 5th value = $14$
   - 6th value = $15$

5. Calculate the median:
   $$	ext{Median} = \frac{14 + 15}{2} = \frac{29}{2} = 14.5$$

**Answer:** $14.5$

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