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Statistika (za biologe, 2.dio) - Pmf

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Vjerojatnost sl. dogadjaja<br />

Vjerojatnost sl. dogadjaja A označit ćemo brojem P (A). Od vjerojatnosti<br />

ćemo traˇziti da <strong>za</strong>dovoljava izvjesna svojstva:<br />

⊲ Za svaki sl. dogadjaj A<br />

0 ≤ P (A) ≤ 1.<br />

⊲ Vjerojatnost da će se iˇsta dogoditi je 1, tj.<br />

P (Ω) = 1.<br />

⊲ Ako se dogadjaji A1, A2, . . . medjusobno isključuju tada vrijedi<br />

P (∪iAi) = �<br />

P (Ai).<br />

i

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