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<math>\sigma_{f_{c2}} = \sqrt{ \frac{(1-1.15)^2+(1-1.15)^2+(1-1.15)^2+(1-1.15)^2+(1-1.15)^2+(1-1.15)^2+(1-1.15)^2+\dots+(1-1.15)^2} {20} } </math>
<math>\sigma_{f_{c3}} = \sqrt{ \frac{(f_{c3_1}-E(V_{
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