CA Foundation · Quantitative Aptitude · Statistical Description of Data
A frequency distribution has a class 40–50, and the class frequency is 18. If the total frequency is 90, what is the relative frequency of this class, expressed as a percentage?
The relative frequency is 20%. It equals the class frequency divided by the total frequency, 18 ÷ 90 = 0.20, which expressed as a percentage is 20%.
- A18%
- B25%
- C20%Correct
- D5%
Explanation
Relative frequency = class frequency / total frequency = 18/90 = 0.20, which is 20%. The value 18% mistakes the frequency itself for a percentage. The value 5% comes from inverting the ratio (90/18 = 5).
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