Strongholds have a 1/10 chance to spawn under a village; does this also apply to abandoned villages? If so, does the reason for abandonment have any impact to this statistic?
While its true that strongholds can generate under villages, I don't think it applies on abandoned ones. I have never seen a stronghold under one at all. You could try, though I doubt a stronghold would even generate under it.
You'll have a better chance that the stronghold would be under a village, but I'm not exactly sure if 1/10 is really the approximate chance for a stronghold to be under a village.
I don’t believe so, I believe only under normal villages, as the Minecraft Wiki says here.
In Bedrock Edition, strongholds generate randomly throughout the world. They sometimes generate under a village.
I hope that answers your question.