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The mean, or average, is calculated by summing all the values in a dataset and then dividing by the number of values. In this case, to find the mean distance of the golf holes, you would add all the distances together and divide by nine, the total number of holes. The mean provides a measure of central tendency that represents the overall average distance.

The median is the middle value in a dataset when the values are arranged in ascending order. If there is an even number of observations, the median is the average of the two middle numbers. For the golf hole distances, you would first sort the distances and then identify the middle value, which gives insight into the central tendency without being affected by extreme values.

A data set is a collection of related values that can be analyzed to extract meaningful information. In this context, the distances of the nine golf holes form a data set that can be used to calculate statistical measures like the mean and median. Understanding the structure and characteristics of the data set is crucial for accurate analysis.