The Board View, as well as the different Charts available in FreeAgent, got an incredible enhancement: the option to calculate statistics. There are 4 options for you to choose from: Average, Max, Min, and Sum. You also have the option to select the field that is going to be used to generate the statistics between currency or number fields.
As soon as you select one of the 4 options and specify the field to be used, you will notice a pill right next to "pivot by" that will describe the type of statistic selected and will show the value.