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błąd losowy
math.	임의오차, 랜덤오차, 확률오차; 표집오차
stat.	임의오차; 랜덤오차; 확률오차
błąd nielosowy
math.	확인오차; 비표집오차

błąd losowy: 5 phrases in 2 subjects

Mathematics	2
Statistics	3