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Probability probability • The chance or likelihood that an event will occur. - It is always a number between zero and one. - It is stated as a fraction, decimal, or percent. • A Probability of Zero is saying that there is no chance of it happening. •A Probability of One is saying that the event will always happen. If the event doesn’t occur every time, or none of the time, then we use this formula to determine the probability: P (event) = # desired outcomes # total possible outcomes Sample space • List of all possible outcomes Theoretical probability • Based on considering all possible outcomes experimental probability • Based on considering all previous outcomes – Real data Probability of multiple events • Find the probability of each individual event • Multiply each probability together Independent Events • The outcome of one event DOES NOT affect the outcome of the next event dependent Events • The outcome of one event DOES affect the outcome of each subsequent event because it changes the sample space. • Assume each event is a success!