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# MMS Probability

### Matoaca Middle School Probability Vocabulary

Term | Definition |
---|---|

Counting Principle | If one event can occur in m ways and another event can occur in n ways, then the two events can occur in mn ways. |

Pascal's Triangle | A triangular pattern of numbers in which each row begins and ends with the number "1", and each number in the middle of a row is equal to the sum of the two numbers immediately above it. |

tree diagram (for probability) | A diagram that shows all of the possible outcomes for an event. Also called a Counting Tree. Counting trees are most useful when all events are equally likely. |

probability | how likely it is for an event to happen |

how to find the probability | P(outcome we are interested in) = # of equally likely favorable outcomes/ total # of equally likely outcomes" |

outcomes | different possible results |

favorable outcomes | results for a particular event to occur |

experimental probability | actual results for a total number of outcomes |

theoretical probability | If all results were equally likely to happen, the calculated (predicted) results |

compound event | the result of combining two or more events. The probability of a compound event is related to the probabilities of the compound events that make it up. |

independent events | Two events are independent if the occurrence of one of the events gives us no information about whether or not the other event will occur; that is, the events have no influence on each other. |

probability of independent events occurring | the probability that they both occur is equal to the product of the probabilities of the two individual events |

dependent event | An event whose outcome is influenced by the outcome of a prior event. |

simulation | "an experiment that models a real-life situation. Creating a Simulation is a strategy for finding the probability of an event by experimentation. |

Created by:
DDavis