What are the chances of a creeper dropping a music disc?

When a creeper is killed by a skeleton arrow, what are the chances of it dropping a music disc? I've gotten quite a few killed by skeletons and I still haven't seen one. I'm wondering how long I should expect this to take.

(Unmodded Windows 10 Edition, if it matters.)


After some additional experimentation, I believe music discs do not exist in Windows 10 edition. Not only have none dropped after numerous attempts, but I'm also unable to craft a jukebox, which seems to indicate they've been intentionally left out.