Sum Avg Min Max
The checkboxes in this section of the screen represent:
sum - A summary of all of the numeric values in a particular column.
avg - The average of all of the numeric values in a particular column.
min - The minimum value of all of the numeric values in a particular column.
max - The maximum value of all of the numeric values in a particular column.
When checking one or more of the options, those aggregate values will be displayed at the bottom of the appropriate column in the adhoc report output.