We cannot predict in advance the outcome of tossing a coin or a die, drawing a card, and so on. Such an experiment is called a random trial since nobody knows the outcome in advance and it seems to be “random”. However, we can know all the possible outcomes of a random trial in advance. For instance, if we consider tossing a coin, the possible outcomes are “H(heads)” and “T(tails)”. Knowing all the possible outcomes in advance, we should assign each outcome with a number in advance; this is its probability.
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