CHIRAG - 020 (GROUP-4)

The Law of Probability

The laws of probability can be used in games, business, and daily life.

 

Probability is Expressed mathematically. Probability equals the number of ways a specified event can occur, divided by the total number of all possible event occurrences. For example, if you have a bag containing three marbles -- one blue marble and two green marbles -- the probability of grabbing a blue marble sight unseen is 1/3.

Law of Addition

The law of addition states the probability of one out of two events occurring is equal to the sum of the probabilities of each event occurring individually, minus the probability of both events occurring. In the five-marbled bag, say you want to know the probability of drawing either a blue marble or a green marble. Add the probability of drawing a blue marble (1/5) to the probability of drawing a green marble (2/5). The sum is 3/5

 

 

Read more: http://www.ehow.com/info_8657085_law-probability.html#ixzz2fDKINml5g