What is the probability that an individual born between the years 1985 and 2005, inclusive, was born in a leap year?

Answer Choices

Correct answer marked below

1/21

1/7

1/5

5/21

Correct

1/4

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Explanation

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Official Explanation

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To determine the probability of being born in a leap year between 1985 and 2005, we first identify the leap years in this range: 1988, 1992, 1996, 2000, and 2004. This gives us a total of 5 leap years. The…

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Comments

CoverJan 25, 2024

Tricky wording but good practice

PrakharFeb 10, 2025

Great question!

What this question tests

What it tests

Your ability to compute probabilities of single and compound events, including 'at least one' questions.

Common trap

Forgetting to use the complement for 'at least one', or treating dependent events as independent.