Atlassian have published an interesting infographic that looks at approximately 5000 agile teams who have been using Jira Agile Cloud for at least six months. From these teams they have compile stats on various elements of successful agile teams.
Atlassian have split Jira into two streams: Core and Software. Jira Core is designed for business users; for example, marketing, operations, and HR. Jira Software is designed for agile software teams and comes bundled with Jira Agile.