Which measure is found by adding all observations and dividing by their number?
Correct answer: A. Arithmetic mean
- A. Arithmetic mean
- B. Median
- C. Mode
- D. Range
Explanation
The arithmetic mean equals the sum of all observations divided by the number of observations. The median is the middle value, while the mode is the most frequent value.
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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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