American Institute of Certified Planners (AICP) Practice Exam

An age group in the 75th percentile?

1. Has 25% of the population below it

2. Has 75% of the population below it

3. Indicates that 75% of the individuals in the set are younger

4. Both B and C

The correct answer is: Both B and C

In statistical terms, when a specific age group is said to fall in the 75th percentile, it means that 75% of the population being analyzed is at or below that age. This is a fundamental concept in understanding percentiles, where the 75th percentile serves as a threshold indicating that a substantial portion of the distribution lies below it. Furthermore, by stating that 75% of the individuals in the set are younger, it emphasizes the position of this particular group relative to the rest of the population. Essentially, it shows how age distribution is concentrated, highlighting that only a quarter of the individuals are older or equal to the age at the 75th percentile. This interpretation allows both statements—concerning the population below the percentile and the individuals who are younger—to accurately reflect the concept of the 75th percentile in a comprehensive way. Therefore, the choice that encompasses both meanings reinforces the understanding of how percentiles work in demographic evaluations.