Based on these results, does sample median appear to be a biased or unbiased estimator of population median?

Question

Alejandro was curious if sample median was an unbiased estimator of population median. He placed ping pong balls numbered from 0 to 32 in a drum and mixed them well. Note that the median of the population is 16.

He then took a random sample of 5 balls and calculated the median of the sample. He replaced the balls and repeated this process for a total of 50 trials. His results are summarized in the dotplot below, where each dot represents the sample median from a sample of 5 balls.

Answer 1

The dotplot / histogram did not propagate into the question. If you repost with the plot I'll be able to help. In general though since the distribution of the balls is uniform and the pull is without replacement, the median of the samples taken will tend to center around the mean, which is the same as the median for a uniform distribution so the results of the samples will be an unbiased estimator. (Central limit theory)