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- Statistical knowledge
- Coding/computation
- SQL/Database Querying

Suppose there are 15 different color crayons in a box. Each time one obtains a crayon, it is equally likely to be any of the 15 types. Compute the expected # of different colors that are obtained in a set of 5 crayons. (Hint: use indicator variables and linearity of expectation)

age | favorite_color | grade | name | |
---|---|---|---|---|

0 | 20 | blue | 88 | Willard Morris |

1 | 19 | blue | 92 | Al Jennings |

2 | 22 | yellow | 95 | Omar Mullins |

3 | 21 | green | 70 | Spencer McDaniel |

The dataframe is showing information about students. Write code using Python Pandas to select the rows where the students' favorite color is blue or yellow and their grade is at least 90.

Click here to view this problem in an interactive Google Colab notebook.

landfillID | weight | state | number_garbage_vehicles |
---|---|---|---|

12300 | 95 | California | 1005 |

12401 | 85 | California | 850 |

00992 | 105 | New York | 1300 |

00882 | 100 | New York | 1000 |

11100 | 55 | Michigan | 580 |

11201 | 75 | Michigan | 700 |

11207 | 60 | Michigan | 500 |

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