ANSWER
Mean because the data is symmetrical
Step-by-step explanation
The measure of center is the value that describes the center of the data. Two measures of center are mentioned: mean and median.
Depending on the dispersion of the data, we will select one of these measures of center:
• If the data is symmetrical, the best measure of center is the mean.
,
• If the data is skewed, the best measure of center is the median.
In this case, we have a graph that is symmetrical - note that both "crests" have approximately the same height. Hence, the best measure of center to use is the mean.