The statistics page can be found as a sub page to the issues page.
Here is an example of what a statistics page can look like
Overview
You will have an overview of all the open and closed issues on the board.
Distribution
Accumulated status
Here you have the accumulated status on open and closed issues.
Type distribution
The type distribution on the different issues.
Plan reliability
Plan reliability measures your ability to close issues before it's due date.
Here you will see milestones and due dates over time.