In a worksheet for statistical calculation, what must be true for the last column?

For a worksheet designed for statistical calculation, the last column is typically intended to aggregate or summarize data related to groups of entries. Therefore, it is essential that this column can accommodate multiple values per group. This allows for calculations such as averages, sums, or other statistical measures that require a broader dataset to provide meaningful insights.

Having multiple values per group enables the computation of more informative statistics, such as the mean or standard deviation, which depend on variability within the dataset. If the last column only had single values per group, it would limit the statistical analysis to very basic calculations and might not reflect the true nature or variability of the data being analyzed, thus reducing the overall effectiveness of the worksheet for meaningful statistical evaluation.