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There are two ways to calculate probability:
Theoretical probability uses math to predict the outcomes. Just divide the favorable outcomes by the possible outcomes.
Experimental probability is based on observing a trial or experiment, counting the favorable outcomes, and dividing it by the total number of times the trial was performed.
Let's look at this example: we tossed a coin 36 times and recorded the outcomes:
H, T, H, H, T, T, H, T, T, T, T, T,
T, T, T, H, H, T, H, H, T, H, H, H,
H, T, H, H, T, H, H, T, H, H, T, H
Based on this experiment: