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\textbf{Which of the following data sets has the largest standard deviation?} 
Overseas Competition->Knowledge Point->Calculation Modules
\textbf{variance is used to measure the spread of data. A, B, C, E are densely distributed.We can verify by calculating the variances out. (A) 2.5, (B) 0.598, (C) 0, (D) 50, (E) 2} 