The Missing Numbers Puzzle

In a certain city, 5% of all the people in town have unlisted phone numbers. If you select 100 names at random from that city’s phone directory, how many people selected will have unlisted phone numbers?

Answer:
None.

Explanation:
If someone’s phone number is unlisted, their name would not appear in the phone directory. Therefore, when you select names from the phone directory, all the names belong to people with listed numbers, and none will have unlisted numbers.