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句子翻译（手写并拍照上传）：Generally,arandomvariablewhichisnormallydistributedwithameanandstandarddeviationcanbewritteninsymbolformas N (μ,σ2 ).
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句子翻译（手写并拍照上传）：Theoreticallythestandarddeviation,whichisthevalueontheXaxisoftheprobabilitycurvethatoccursatthepointsof inflecxion ofthecurve,isobtainedfromaninfinitenumberofvariablesknownasthepopulation.
句子翻译（手写并拍照上传）：Error propagation is one of the many aspects of analyzing errors. It is the mathematical process used to estimate the expected random error in a computed or indirectly measured quantity caused by one or more identified and estimated random errors in one or more identified variables that influence the precision of the quantity.
拆装方便,通用性强,周转率高的模版是( )
跨度为6m,混凝土强度为C30的现浇混凝土板,当混凝土强度至少达到( )时方可拆除底模
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