We know that the population median is 16, but then he starts taking a sample of five balls, so n equals five, and he calculates a sample median. Sample median. And then he replaced the balls and repeated this process for a total of 50 trials. His results are summarized in the dot plot below, where each dot represents the sample median from a sample of five balls. So he does this. He takes these five balls, puts them back in, then he does it again, then he does it again, and every time, he calculates the sample median for that sample, and he plots that on the dot plot. So, and he'll do this for 50 samples.