The following table gives a number of Rockwell B hardness values that were measured on a single steel specimen. Compute average and standard deviation hardness values.
83.3 | 80.7 | 86.4 |
88.3 | 84.7 | 85.2 |
82.8 | 87.8 | 86.9 |
86.2 | 83.5 | 84.4 |
87.2 | 85.5 | 86.3 |
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