The third quartile (Q3) of the given median income data set is $70.9K.

Would you like further details on this calculation or have any questions?

Here are five related questions to consider:

1. What is the first quartile (Q1) of this data set?
2. What is the interquartile range (IQR) for this data?
3. How would you interpret the Q3 value in a real-world context?
4. What are the mean and median of this data set?
5. How does the data distribution affect the quartiles?

Tip: The third quartile (Q3) helps in identifying the upper 25% of a data set, showing the range of the highest incomes in this case.