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probability formula probability formula probability is based on observations of certain events probability of an event is the ratio of the number of observations of the event to the total numbers of the observations an experiment is a situation involving chance or probability that leads to results called outcomes an outcome is the result of a single trial of an experiment the probability of an event is the measure of the chance that the event will occur as a result of an experiment probability formula probability is the measure of how likely an event is and an event is one or more outcomes of an experiment probability formula is the ratio of number of favorable outcomes to the total number of possible outcomes measures the likelihood of an event in the following way if pa pb then event a is more likely to occur than event b if pa pb then events a and b are equally likely to occur know more about square root calculator math.tutorvista.com page no 1/4

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what is the formula for probability the probability of an event tells that how likely the event will happen situations in which each outcome is equally likely then we can find the probability using probability formula probability is a chance of prediction if the probability that an event will occur is x then the probability that the event will not occur is 1 x if the probability that one event will occur is a and the independent probability that another event will occur is b then the probability that both events will occur is ab probability of an event a can be written as how to solve probability problems a probability is determined from an experiment which is any activity that has an observable outcome like tossing a coin and observing whether it lands heads up or tails up the possible outcomes of an experiment are called sample space of the experiment steps to find the probability step 1 list the outcomes of the experiment step 2 count the number of possible outcomes of the experiment step 3 count the number of favorable outcomes step 4 use the probability formula solved examples question 1 two dice are rolled once calculate the probability that the sum of the numbers on the two dice is 5 learn more compound interest calculator math.tutorvista.com page no 2/4

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solution possible outcomes sample space 1 1 1 2 1 6 2 1 2 2 2 6 3 1 3 2 3 6 4 1 4 2 4 6 5 1 5,2 5 6 6 1 6 2 6 6 total possible outcomes 36 number of outcomes of the experiment that are favorable to the event that a sum of two events is 6 favorable outcomes are 1 5 2 4 3 3 4 2 and 5 1 number of favorable outcomes 5 example 2 john plays game his college he did not score in 29 out of 58 games he played what is the experimental probability of john score in a game solution step 1 number of game john make score 58 ­ 29=29 step 2 p john make a score number of games in which john make goals total number of games john play step 3 2958 12 step 4 probability of john make a goal in a game is 12 math.tutorvista.com page no 4/4

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thank you math.tutorvista.com

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