11. In the Value Field Settings dialog that appears,change Sum to Count.Click OK.
12. In the Options ribbon,click the PivotChart icon.Choose a Stacked Columns chart.Click OK.
13. In the Layout ribbon,choose Lines, Series Lines.
14. Also in the Layout ribbon,choose Legend,No Legend.
The result is the chart shown in Figure 8.17.For each customer,you can expect the invoices to be grouped around a cen-
tral value.If you see any invoices that fall far outside the normal range,they might be worthy of audit.In Figure 8.17,for
example,you can see that Fabulous Tripod tends to order in the $10,000 to $30,000 range,yet they had at least one
invoice in the $125,000 ...