Problem-Solving and Data AnalysisMediumMean after adding a constant to every value
Problem-Solving and Data Analysis practice question
A data set of 8 numbers has a mean of 15. If 3 is added to each of the 8 numbers, what is the mean of the new data set?
Answer: 18
Adding 3 to every value adds 3 to the mean: 15 + 3 = 18.
Common wrong answers
- If you answered 15
- 15 assumes the mean is unchanged.
- If you answered 39
- 39 adds 3 × 8 to the mean.
- If you answered 15.375
- 15.375 adds 3/8 to the mean.
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