Problem-Solving and Data AnalysisMediumMode of a data set
Problem-Solving and Data Analysis practice question
The number of books read by each of eight students over the summer was 2, 9, 9, 4, 6, 9, 4 and 13. What is the mode of these data?
- A. 9Correct
- B. 7.5
- C. 7
- D. 11
Answer: A. 9
The mode is the value that appears most often. 9 appears three times, 4 appears twice, and the rest once. The mode is 9.
Why the other answers are wrong
- B. 7.5
- 7.5 is the MEDIAN: sorted, the middle two values are 6 and 9, and their average is 7.5.
- C. 7
- 7 is the mean, 56 / 8.
- D. 11
- 11 is the range, 13 − 2.
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