Data presentation and diagrams Quiz
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5 questions, one answer each
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1. A class 5 to 15 minutes has frequency 40. What is its frequency density?
- A. 0.25
- B. 4
- C. 8
- D. 40
2. A histogram bar has width 4 and height 2.5 (frequency density). What frequency does it represent?
- A. 6.5
- B. 1.6
- C. 10
- D. 20
3. In a relative frequency density histogram, what is the total area of the bars?
- A. the mean
- B. the number of classes
- C. 100
- D. 1
4. Class 0 to 10 has frequency 20 and class 10 to 30 has frequency 30. Which is the modal class?
- A. 0 to 10
- B. 10 to 30
- C. They are equal
- D. It cannot be found
5. The class 20 to 30 has frequency 30. Assuming even spread, estimate the frequency from 25 to 28.
- A. 3
- B. 9
- C. 15
- D. 30