A value that represents the average amount of work completed in the last seven sprints including the the selected sprint. here the first sprint is the selected sprint and the rest six sprints should be determined as sorting by complete date from latest to oldest.
Should be measured for 3 estimations - Story points, Original Time Estimate, Issue Count. The Original Time Estimate could have the following formats - minutes, hours, days, weeks.
Velocity = Completed
(Completed of Sprint 1 + Completed of Sprint 2+…+Completed of Sprint 7) / 7
7 - number of sprints