In that distribution, which class interval has the highest frequency?

In that distribution, which class interval has the highest frequency?

• A. 5-9
• B. 10-14
• C. 15-19
• D. 20-24

Answer: (C)

The idea to focus on is how a frequency distribution shows how many data points fall into each range. The class interval with the highest frequency is the modal class—it's the range that has the most observations, often depicted as the tallest bar in a histogram or the largest count in a table. In this distribution, the interval from 15 to 19 is the one with the most data points, so it has the highest frequency. The other intervals contain fewer observations, which is why they don’t surpass 15–19. If two intervals had the same top count, there would be more than one modal class, but here only 15–19 stands above the rest.

The idea to focus on is how a frequency distribution shows how many data points fall into each range. The class interval with the highest frequency is the modal class—it's the range that has the most observations, often depicted as the tallest bar in a histogram or the largest count in a table. In this distribution, the interval from 15 to 19 is the one with the most data points, so it has the highest frequency. The other intervals contain fewer observations, which is why they don’t surpass 15–19. If two intervals had the same top count, there would be more than one modal class, but here only 15–19 stands above the rest.