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The subject of this work is the analysis of hazard distribution in the network systems. In the age when transport flows in the railway and road systems, information flows in the internet channels, etc. intensify, hazard distribution in the network systems becomes a more relevant and important issue. In the paper various theoretical hazard type distributions in the network systems are analysed. Mathematical model of hazard distribution and accumulation in the nodes of the network was created.

The analysis of the of students’ assessment during final exams in secondary school and their first and second sessions at college and at university in mathematics was presented. Analysis demonstrates that students are not ready to work hard in case to get better marks at college and university. The students' grades are decreasing; but there is correlation between school grade and university's or college’s grade.

There is not abstract.