The mean of the median incomes for the 15 states in the data set is approximately $64.49 thousand.

Would you like more details or have any questions?

Here are 5 related questions to deepen your understanding:

1. What is the median value of the median incomes listed?
2. How does the standard deviation of the data set describe the income variation among states?
3. What would happen to the mean if the highest value (Hawaii) were removed?
4. How does the mean compare to the highest and lowest median incomes in the data set?
5. What percentage of states listed fall above the calculated mean income?

Tip: The mean can sometimes be affected by extreme values (outliers), so it's helpful to also consider the median for better insight into typical values.