APFIVE Standard Deviation with an Added Data Point
A researcher has a dataset with $$n = 25$$ and $$\sum(x_i - \bar{x})^2 = 240$$. If one additional data point with a value equal to the original mean is added, what will be the new standard deviation?
A
9.6
B
3.10
C
3.04
D
2.9
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