# 11.4.1. Calculating Probability

In one of the shows at the pyramids, one of the tourists is chosen randomly to win a prize, and the table below represents the number of tourists of different nationalities. Determine the probability that the chosen tourist is Russian or Greek.

Attendence | Russians | Greeks | Americans | Total |
---|---|---|---|---|

Men | 50 | 10 | 15 | 75 |

Women | 60 | 80 | 35 | 175 |

Total | 110 | 90 | 50 | 250 |

- A0.8
- B0.64
- C0.56
- D0.44

### Example

In one of the shows at the pyramids, one of the tourists is chosen randomly to win a prize, and the table below represents the number of tourists of different nationalities. Determine the probability that the chosen tourist is Russian or Greek.

Attendence | Russians | Greeks | Americans | Total |
---|---|---|---|---|

Men | 50 | 10 | 15 | 75 |

Women | 60 | 80 | 35 | 175 |

Total | 110 | 90 | 50 | 250 |

### Solution

The probability of event

The probability of event

The notation

Thus, the probability of selecting a Russian tourist or a Greek tourist is 0.8.