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# Math 153 Chapter 5

### Probability & Counting Methods

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

The word "OR" in probability indicates which operation | Addition |

What is the probability of an event that is impossible? | 0 |

Suppose that a probability is approximated to be zero based on empirical results. Does this mean that the event is impossible? | No |

True or false: In a probability model, the sum of the probabilities of all outcomes must equal 1. | True |

In probability, a(n) ________ is any process that can be repeated in which the results are uncertain. | experiment |

If E and F are disjoint events, then P(E or F)= ______________. | P(E) + P(F) |

If E and F are not disjoint events, then P(E or F)equals=_____________________. | P(E) + P(F) – P(E and F) |

Two events E and F are _____________ if the occurrence of event E in a probability experiment does not affect the probability of event F. | independent |

The word and in probability implies that we use the ______________ rule. | multiplication |

True or false: When two events are disjoint, they are also independent. | False |

The notation p(F|E) means the probability of event__ given event __ | F, E |

A___ is an ordered arrangement of r objects chosen from n distinct objects without repetition | permutation |

A___ is an arrangement of r object chosen from n distinct objects without repetition and without regard to order | combination |

In combination problem, order is not important True or False | True |

In a probability model, the sum of the probabilities of all outcomes must equal 1 True or False | True |

In probability a(n) _ is any process that can be repeated in which the results are uncertain. | experiment |

Two events E and F are _ if the occurrence of event E in probability experiment does not affect the probability of event F | independent |

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