so what I don't get is why we have to learn probability; it's not like there's an everyday use for it, and not everybody is going to be a Weatherman/girl.

Answer 1

Did you know that the word in your name is spelled Awesome?

You can make that argument about almost everything you study in school. We do not have a crystal ball showing exactly what everyone needs to know for the next 60 years or so.

Read this for some ideas about the uses of probability.

https://www.bartleby.com/essay/Probability-in-Everyday-Life-and-in-The-F39DGD4C8B6A

Answer 2

Because the teachers said, "Let there be useless math." and there was useless math.