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In a study, the cost overruns/underruns for 6 rail projects in the percentage of the original cost have been collected as follows: 6%, 9.2%, -0.5%, 7.1%, 10.3%, 4.2%. What is the mean and standard deviation of this sample respectively? - 6.22% and 3.55% - 6.05% and 3.88% - 6.22% and 0.13%
Sagot :
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