Fifteen out of 60 participants scored between 17 and 21 on a test. what is the relative frequency of the class interval 17-21?

The frequency is how often something occurs. Here 15. It occurred 15 times that the participants scored in the interval given.

The relative frequency (expressed as a percent) looks at how often something occurred relative to the overall occurrences. Here 15/60 = 1/4 = 25%

The relative frequency is 25%

The correct answer is:

1/4, or 25%.

Explanation:

The relative frequency is the fraction of times something occurs compared to the total.

In this problem, 15 out of 60 participants are in this range.  This is written as:
15/60.

This will then simplify:
15/60 = 1/4 = 0.25 = 25%

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