Summarize the data displayed in a Grid View with column totals.
Display data summaries with Grid column totals in the footer of a Grid View...
As well as the footer for each configured grouping:
All column types support displaying the count or percentage of empty or filled cells.
Columns containing numeric fields allow you to display the sum, average, lowest or highest value, median value, standard deviation, or the range (lowest and highest values) of displayed values in the column.
Columns containing date-type fields support displaying the column’s earliest date, latest date, or the date range for displayed values (earliest date to latest date).