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Banaketa-funtzio.
Banaketa-funtzio
Probabilitate-teorian, banaketa-funtzioa balio batetik beherako probabilitatea (balio hori barne) ematen duen funtzio bat da. Probabilitate-funtzioekin (zorizko eta dentsitate-funtzioarekin estu loturik dago: adibidez, dentsitate-funtzio batean, banaketa funtzioak x balio baterainoko azalera ematen du. Horrela, dentsitate-funtziotik (eta baita ere probabilitate-funtziotik zorizko aldagai diskretuetan) banaketa-funtzioa eratortzen da eta alderantziz.
Matematikoki honela definitzen da, Xzorizko aldagai baterako:
Honela kalkulatzen dira probabilitateak banaketa-funtzioarekin:
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