Numbers
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Add calculations to category groups in Numbers on iPad
For each group or subgroup in a categorized table, you can add a function (a predefined calculation such as sum, count, or average) to summarize the data in any column. For example, in a table with shirt sales data categorized by month, you could add a function to count the number of shirts sold each month. You can add these functions to the summary row in each category in your table.
You can also chart the results of the calculations in a summary row column. Select the column containing the summary calculations you want to chart, tap , tap Create New Chart, then select a chart type.