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# LISD 6th EUS 9

### Probability and Statistics

Question | Answer |
---|---|

complementary events | two events are complements if the sum of their probabilities is 1. (The probability of something happening plus the probability of it NOT happening is 1.) |

experimental probability | the ratio of the number of favorable results to the total number of trials in a probability experiment; is based on what DOES happen in an experiment |

favorable outcome | the desirable outcome |

frequency table | a table that lists items and uses tally marks to collect data and show the number of times they occur |

interval | the equal parts a scale is divided into on a graph |

line plot | a number line used to show frequency of data |

mean | the mathematical average of the data; found by finding the sum of all the data and dividing by the number of data pieces |

measure of central tendency | "numbers or pieces of data that can represent or summarize a whole set of data, such as mean, median, and mode" |

probability | ratio of favorable outcomes to total possible outcomes |

sample space | the set of all possible outcomes of a probability event |

scale | the set of numbers used to label an axis when graphing; must include the least and greatest numbers in the set |

simple event | a probability event that consists of exactly one outcome |

statistics | "the study of this topic deals with collecting, organizing, and interpreting data" |

stem-and-leaf plot | a display of numerical data in which each piece of the data is separated into two numbers based on place value and placed in columns of a t-chart |

theoretical probability | the ratio of the number of favorable outcomes to the total number of possible outcomes; is based on what should happen under perfect circumstances |

tree diagram | a visual representation that shows all possible outcomes in a probability event |

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aprilchauvette