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==Safety factors==
The safe design of structures requires a design approach which takes account of the [[statistics|statistical]] likelihood of the failure of the structure. Structural design codes are based upon the assumption that both the loads and the material strengths vary with a [[normal distribution]].{{Citation needed|date=March 2019}}
The job of the structural engineer is to ensure that the chance of overlap between the distribution of loads on a structure and the distribution of material strength of a structure is acceptably small (it is impossible to reduce that chance to zero).
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