# Question: an article in the journal of data science quota statistical...

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An article in The Journal of Data Science ["A Statistical Analysis of Well Failures in Baltimore County" (2009, Vol. 7, pp. 111-127)] provided the following table of well failures for different geological formation groups in Baltimore County.

wells | ||

Geological Formation Group | Failed | Total |

Gnesis | 170 | 1685 |

Granite | 2 | 28 |

Loch raven schist | 443 | 3733 |

Mafic | 14 | 363 |

Marble | 29 | 309 |

Prettyboy schist | 60 | 1403 |

Other schists | 46 | 933 |

Serpentine | 3 | 39 |

Let A denote the event that the geological formation has more than 1000 wells, and let B denote the event that a well failed. Determine the number of wells in each of the following events.

(a) A and B

(b) A'

(c) A or B

(d) A or B'

(e) A' and B'