If you were to calculate the standard deviation on the worksheet, without the STDEV.P function, hereâs how you would do it. 1  Find the average of the numbers in the pivot table data. 2  From each number, subtract the average. 3  Square the calculated difference for each number. 4  Find the average of the squared difference. 5  Find the square root of the average.
A pivot table is a tool that you can use to summarize data when you have a lot of it in a worksheet. A pivot table can count totals, give an average of the data, or sort data â in addition to other things. In this article, we are going to go in-depth as we learn to create and work with pivot tables.
The Average Function. The Average function in a pivot table works like the AVERAGE function on the worksheet to calculate the average (mean) of the values. It totals all the underlying values in the Values area, and divides by the number of values.hen you use the Average summary function, the results will probably show a strange mixture of decimal places, as shown in the pivot table at the left, in the screen shot below. Format the field to have a consistent number of decimal places (as in the pivot table at the right, above), so the numbers are easy to compare.