A simplified Product-Burndown-Chart is shown in Figure 1. Here the team had a constant velocity of 50 story points per sprint. In the second sprint some user stories (with 100 story points) had been added and in the fifth sprint some user stories (100 story points) have been removed. The sprint with the number zero is just used to show the initial backlog value before the first sprint (Table 1 contains the raw data of the graph).
Table 1: Data of Product Burndown-Chart-Sample
The purpose of the Product-Burndown-Chart is to show the team and stakeholders how many sprints will be needed to implement all remaining user stories or how many user stories can be completed in the remaining time.