There are numerous laws or rules. The related link probably described the most basic of them, listed below: 1. For any event, the probability must be between 0 and 1, inclusive. 2. The sum of all the events must equal 1.
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The laws of probability predict what is likely to occur, not necessarily what will occur.
name two area where probability is used
The probability, when the 2-dice total is 5, that one of the two dice shows a two is 1/2. The probability that that die is selected is 1/4.The probability, when the 2-dice total is 5, that one of the two dice shows a two is 1/2. The probability that that die is selected is 1/4.The probability, when the 2-dice total is 5, that one of the two dice shows a two is 1/2. The probability that that die is selected is 1/4.The probability, when the 2-dice total is 5, that one of the two dice shows a two is 1/2. The probability that that die is selected is 1/4.
The probability of two tails on two tosses of a coin is 0.52, or 0.25.
That probability is the product of the probabilities of the two individual events; for example, if event A has a probability of 50% and event B has a probability of 10%, the probability that both events will happen is 50% x 10% = 5%.