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complement: all the ways that an event can not happen.
ex: When rolling a number cube, the complement of rolling a 3 is rolling a 1, 2, 4, 5, or 6. |
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compound event: an event made up of two or more simple events.
ex: When tossing a coin and rolling a number cube, the event of the coin landing heads up and the number cube landing on 3 is a compound event. |
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equally likely: Outcomes that have the same probability.
ex: When you toss a coin, the outcomes “heads” and “tails” are equally likely. |
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experimental probability: The ratio of the number of times an event occurs to the total number of trials, or times that the activity is performed.
ex: Kendra attempted 27 free throws and made 16 of them. Her experimental probability of making a free throw is
number made/number attempted
16/27 = 0.59. |
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outcome: A possible result of a probability experiment.
ex: When rolling a number cube, the possible outcomes are 1, 2, 3, 4, 5, and 6. |
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| prediction: A guess about something that will happen in the future. |
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probability: A number from 0 to 1 (or 0% to 100%) that describes how likely an event is to occur.
ex: A bag contains 3 red marbles and 4 blue marbles. The probability of randomly choosing a red marble is 3/7. |
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Definition
theoretical probability: The ratio of the number of equally likely outcomes in an event to the total number of possible outcomes.
ex: When rolling a number cube, the theoretical probability of rolling a
4 is 1/6. |
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