This document demonstrates the Benford's law.
To know more about Benford's law, please visit the below link
Benford’s law can often be used as an indicator of fraudulent data, and can assist with auditing accounting data
Benford's law represents the distribution of 1st Digit of your data set. For eg. sales figure $ 11292 can be represented as 1.
In above chart, we can identify that distribution of the digit 1 of actual data is higher than the Benford's law distribution for the digit 1. That means we need to investigate the transactions of the sales figures starting from digit 1.
Please find the attached sample data with QVW file
Also see, Bollinger Bands