Empirical probabilities.
empirical probability is when you actually experiment with it and get data values, and theoretical probability is when you use math to make an educated guess.
When you have a model that describes the required situation well enough so that you can use scientific laws to calculate the probabilities of the outcomes of the experiment.
Repeated trials.
Sometimes it is possible to define a model for a trial or experiment and then use mathematical or scientific rules to determine the probability of the possible outcomes. Such a procedure gives theoretical probabilities.
If the events are independent then you can multiply the individual probabilities. But if they are not, you have to use conditional probabilities.
like for or we use + and for 'and' we use multiplication
The process of elimination
To find the theoretical value in chemistry, you typically start with a balanced chemical equation. Then, you use stoichiometry to calculate the amount of reactants needed to produce a certain amount of product based on the coefficients in the balanced equation. This calculated value is the theoretical value.
To calculate the probabilities of compound events, you can use the multiplication rule or the addition rule, depending on whether the events are independent or mutually exclusive. The multiplication rule is used when the events are independent, and you multiply the probabilities of the individual events. The addition rule is used when the events are mutually exclusive, and you add the probabilities of the individual events.
The difference between the two is that 'you would find it easy to use' implies that there is a reason behind it. It is also more theoretical than 'will' in the sense that you might not perform the 'using'.
Theoretical physics explores concepts that are not yet proven by experimentation.