What are the chances of getting a Planeswalker in a booster pack?

Related questions

1. Are Magic booster packs random?
2. What is the chance of getting a mythic rare?
3. Is Friday Night Magic standard or modern?
4. Can both players have the same Planeswalker?
5. What does Mfg mean with a date?
6. How many creatures should you have in a mtg deck?
7. Are all Planeswalkers mythic rare?
8. How rare is a foil mythic?
9. Why are magic cards so expensive?
10. How many legendary artifacts can you have?

Tags

1. #planeswalkers
2. #booster
3. #chances
4. #opening
5. #getting
6. #mythic
7. #planeswalker
8. #depends
9. #roughly
10. #which
11. #other
12. #chance