- AMean 25, SD 4
- BMean 25, SD 9
- CMean 20, SD 4
- DMean 25, SD 20
Step-by-Step Solution
Adding a constant shifts the mean by 5 but leaves the spread unchanged: mean 25, SD 4.
Answer: A) Mean 25, SD 4
A data set has mean 20 and standard deviation 4. If 5 is added to every observation, what are the new mean and SD?
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