Okay kiddo, let's talk about probabilistic propositions! Basically, it's when someone says something might happen or might be true, but they're not totally sure. It's kind of like when you ask if it's going to rain tomorrow and someone says "maybe" because they don't know for sure.
So, let's say I have a bag with 5 red balls and 5 blue balls in it. If I reach in and grab one ball, I might say "I think there's a 50% chance I'll grab a red ball and a 50% chance I'll grab a blue ball." This is a probabilistic proposition because I'm not certain which ball I'll get - it depends on chance.
Another example could be someone saying "I think there's a good chance that my favorite team will win the game tonight." This is also a probabilistic proposition because they don't know for sure what will happen - it's just their opinion.
Overall, a probabilistic proposition is just a statement that's based on probability or chance rather than certainty. Does that make sense?