Is Scrum master a full time role?

Related questions

1. What does a product owner do during a sprint?
2. What's a sprint in Agile?
3. Who owns the product backlog?
4. What does Scrum stand for in agile?
5. What is a user story in Agile?
6. Which side does a scrum half put the ball in?
7. Can product owner change the sprint backlog any day?
8. Who can change the backlog during an iteration?
9. Who is responsible for ROI in Scrum?
10. What is the purpose of sprint burn down chart?

Tags

1. #master
2. #their
3. #impediments
4. #always
5. #there
6. #masters
7. #better
8. #solve
9. #scrum
10. #members
11. #teams