Suppose you interview 10 randomly selected workers and ask how many miles they commute to work. you'll compute the sample mean commute distance. now imagine repeating the survey many, many times, each time recording a different sample mean commute distance. in the long run, a histogram of these sample means represents

A histogram of these sample means represents the sampling distribution of the sample mean. The histrogram of the workers you asked how many miles they commute to work will represent the sampling distribution of the sample mean of the 10 workers that been asked. So the answer in this question is simply, the reprsentation of the histrogram is the sampling distribution of the sample mean.