What is the relative frequency (%) for the 30–35 years class interval?
2015
What is the relative frequency (%) for the 30–35 years class interval?
Answer: D. 35% — ConceptThe frequency of a class interval is the number of observations that fall within that interval. The relative frequency percentage is calculated as…
- A.
20%
- B.
25%
- C.
30%
- D.
35%
Show answer & explanation
Correct answer: D
Concept
The frequency of a class interval is the number of observations that fall within that interval.
The relative frequency percentage is calculated as (class frequency / total number of observations) × 100.
Application
From the age column, the observations in the 30–35 years interval are 32, 31, 34, 33, 31, 30, and 34. Thus, the class frequency is 7.
The table contains 20 employees in total.
Relative frequency = (7 / 20) × 100 = 35%.
Cross-check
The other 13 employees form 65% of the total; 35% + 65% = 100%, confirming the count.
Therefore, the relative frequency in the 30–35 years class interval is 35%.