Problem-Solving and Data AnalysisEasy–MediumFifth value from a known mean
Problem-Solving and Data Analysis practice question
A data set has five values and a mean of 10. Four of the values are 8, 9, 11, and 12. What is the fifth value?
Answer: 10
The five values total 50; the four known ones total 40, so the fifth is 10.
Common wrong answers
- If you answered 40
- 40 is the total of the four known values.
- If you answered 50
- 50 is the total of all five.
- If you answered 12.5
- 12.5 divides 50 by 4.
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