Answer:
D. The median because it is not strongly affected by the relatively few families with extremely high net worth.
Explanation:
If the median net worth of families in a particular country was $77.7 thousand.
It means that at least half of the families in the country have a net worth of $77.7 thousand or below.
However, for the mean net worth of the families to be $487.4 thousand, there have to be some extremely high net worth families.
Median is the preferred measure of central tendency when there are a few extreme scores in the distribution of the data. as a single outlier can have a great effect on the mean
Therefore, the median is an appropriate measure of the center because it is not strongly affected by the relatively few families with extremely high net worth.