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To find the probability of an outcome you divide the number of instances of the outcome by the number of instances of the population.

For example, to determine the probability of drawing a diamond from a standard deck of 52 cards, consider that there are 13 diamonds in the deck, so there are 13 instances of that outcome, while there are 52 instances of the population, so 13 divided by 52 is also 1 divided by 4, which is 0.25.

It gets more complicated when you have multiple trials, but it is still a matter of counting and dividing.

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