To determine the position of the median value in a list of 13 ordered ages, you can use the following formula for the position of the median:

$\text{Position of the median} = \frac{n + 1}{2}$

Where $n$ is the total number of values in the list. In this case, $n = 13$, so:

$\text{Position of the median} = \frac{13 + 1}{2} = \frac{14}{2} = 7$

The median value will be in the 7th position in the list of ages.

Would you like more details on how median works?

Here are 5 related questions:

1. How would you find the median if the number of ages was even?
2. What if Peter forgot to order the ages—how would you proceed?
3. Why is the median a useful measure compared to the mean?
4. How does the median change if more members are added to the list?
5. Can you always find the median without knowing all the data values?

Tip: The median is particularly useful when data includes outliers, as it is not affected by extreme values.