The midpoint of a class interval from 20 to 30 is called its:
Correct answer: D. Class mark
- A. Class boundary
- B. Cumulative frequency
- C. Class frequency
- D. Class mark
Explanation
The class mark is the midpoint of a class and is calculated as (20 + 30) divided by 2, giving 25. Class frequency records the number of observations in the interval.
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About Data Collection and Presentation
Data collection covers primary and secondary sources, qualitative and quantitative data, discrete and continuous variables, sampling methods and questionnaire design. Presentation includes frequency tables, grouped data, bar charts, histograms, pie charts, line graphs and cumulative frequency curves, with care over class intervals and misleading scales.
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