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The mean, or average, is a measure of central tendency calculated by summing all values in a dataset and dividing by the number of values. It provides a single value that represents the overall distribution of the data. In this case, to find the mean of body temperatures, you would add all the temperatures together and divide by the total number of temperatures listed.

Evaluating the reasonableness of statistical results involves assessing whether the calculated mean accurately reflects the data's characteristics. This can include checking if the mean falls within the range of the data and considering the context of the data, such as typical body temperature ranges for adults. A reasonable result should align with expectations based on prior knowledge.

A data set is a collection of related values or observations, often organized in a structured format. In this question, the body temperatures of adult males form a data set that can be analyzed statistically. Understanding the composition and context of the data set is crucial for accurate calculations and interpretations, such as determining the mean.