To find the middle value in a data set, which Excel function should you use?  A. AVERAGE  B. MODE  C. MEDIAN  D. RANK

To find the middle value in a data set, you should use the C. MEDIAN function in Excel. The MEDIAN function specifically calculates the median, which is the middle value when a data set is ordered from smallest to largest. If there is an even number of observations, it returns the average of the two middle numbers. This function is ideal for identifying the central tendency of a data set, especially when the data may contain outliers that could skew the mean.

Here's a brief explanation of the options:

1. AVERAGE - calculates the mean of the data set.
2. MODE - finds the most frequently occurring value.
3. MEDIAN - identifies the middle value.
4. RANK - ranks the numbers in a data set.

Thus, C. MEDIAN is the correct choice.