what are the applications of probability in the various fields?

Question

give me answers that are simple and understandable

Answer 1

Probability theory is important if you want to become a professional poker player. I hope the reason is obvious.

It is important in judging opinion polls (like Gallup or Harris polls) because statistics is based on probability theory.

It is important in finance. In asset pricing, you have to know about the probabilities of future returns to figure out current values.

It is important in sales forcasting -- because you need to assign different probabilities to different possible outcomes.

It is important in running a restaurant, because you need to know how much food to order for tonight's dinner, how many waiters to have show up to work and how much loquor to buy.

I can't think of many areas where it isn't important. There was a baseball manager who used to keep track of the variance of pitcher's pitches. If the variance was low, he would let them paint the corners & mix up their pitches -- but if it was high, he'd tell them to aim for the middle of the plate -- knowing it would either be inside or outside & hard to figure out how to hit it.