Question

Problem 14.65. You want to get from point A to point B and then back to A. To get from A to B there are 3 possible routes while to get from B to A there are 4 possible routes. The time, in minutes, to travel each route are:

Route |
From A to B |
From B to A |

1 |
20 |
10 |

2 |
15 |
12 |

3 |
12 |
15 |

4 |
20 |

- How many ways are there to complete the round trip?
- If the routes are chosen randomly, both going and returning, find the pmf of the travel time.

Answer #1

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