Any idea how many % get accepted and how many get rejected?
No. They don't release that kind of info. It is not really about %. Think about it like this, for example. YT is a for-profit business. They want to make money. They make money by placing ads on Billboards. Your videos are the Billboard. If your billiards are located along a road that no one ever travels on, they will be a lot less likely to pay you to put ads on your billboard. As a channel, you are essentially a billboard company, offering YT the opportunity to put ads on your billboards. YT is going to look at the quality of the traffic that will see your billboards and decide whether that traffic is the type of traffic that will be worth paying to pay to put ads on your billboards.
So, to maximize your chance of being accepted, you need to think about what is best for YT, not necessarily what type of content you want to produce. Let's say you want to put out videos about your ant farm, which is nothing more than camera monitoring your ant's activity. It would very unlikely that this type of channel would get accepted, even if it met the requirement.
Hopefully this helps.