Shorty’s Muffler advertises it can install a new muffler in 30 minutes or less. However, the work standards department at corporate headquarters recently conducted a study and found that 20% of the mufflers were not installed in 30 minutes or less. The Maumee branch installed 50 mufflers last month. |

If the corporate report is correct: |

a. | How many of the installations at the Maumee branch would you expect to take more than 30 minutes? |

Installation |

b. | What is the likelihood that fewer than eight installations took more than 30 minutes? (Round z-score computation to 2 decimal places and your final answer to 4 decimal places.) |

Likelihood |

c. | What is the likelihood that eight or fewer installations took more than 30 minutes? (Round z-score computation to 2 decimal places and your final answer to 4 decimal places.) |

Likelihood |

d. | What is the likelihood that exactly 8 of the 50 installations took more than 30 minutes? (Round z-score computation to 2 decimal places and your final answer to 4 decimal places.) |

Likelihood |

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