Problem-Solving and Data AnalysisMediumMean after doubling every value
Problem-Solving and Data Analysis practice question
A data set of 8 values has a mean of 6. Every value in the set is then doubled. What is the mean of the new data set?
Answer: 12
Doubling every value doubles the sum and so doubles the mean.
Common wrong answers
- If you answered 6
- 6 assumes the mean is unchanged.
- If you answered 8
- 8 adds 2 to the mean.
- If you answered 48
- 48 is the original sum of the values.
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