Histograms Quiz
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5 questions, one answer each
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1. What should the vertical axis of a histogram be labelled?
- A. Frequency
- B. Frequency density
- C. Class width
- D. Cumulative frequency
2. A class interval 0–20 has a frequency of 60. What is the frequency density?
- A. 1200
- B. 3
- C. 0.33
- D. 60
3. What does the area of a bar in a histogram represent?
- A. The class width
- B. The frequency density
- C. The frequency
- D. The cumulative frequency
4. A histogram bar has frequency density 5 over the class interval 30–45. What is the frequency of that class?
- A. 5
- B. 9
- C. 75
- D. 15
5. Why are histograms with unequal class widths used instead of ordinary bar charts for grouped continuous data?
- A. Bar charts cannot show continuous data at all
- B. Plotting raw frequency as bar height would distort comparisons when class widths differ, so area (via frequency density) is used instead
- C. Histograms always require fewer classes
- D. Bar charts can only show categorical data with exactly 5 categories