You need to remember that the mean is equal to median if the distribution is symmetrical.
The graph has a bell shape and the portions above and below a fixed point (vertex of the bell) are mirror images.
For the numbers you've given, the mean is:
mean = (2+3+5+7+8)/5 = 25/5 = 5
median = the middle number of the five given values = 5
ANSWER: The median=mean=5, therefore you may obtain a symmetric distribution of the numbers.
Just add another 5 in the middle
mode=5 because it appears the most