Moderate
The arithmetic mean _________ by 10 if 10 is added to all values?
Correct answer: D. Increase
- A. Decease
- B. Smaller
- C. Largest
- D. Increase
Explanation
Adding a constant to every observation adds the same constant to the arithmetic mean: mean(new data) = mean(old data) + 10. Hence the mean increases by 10.
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