@ARTICLE {, title = {Pravdepodobnosť a lineárnosť}, author = {Riečan, Beloslav}, journal = {Obzory matematiky, fyziky a informatiky}, year = {2013}, volume = {42}, number = {2}, pages = {11--18}, issn = {1335-4981}, abstract = {Applying elementary approach, we prove the linearity of mean value of random variables, both for discrete and continuous case.}, }