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Slika - Shrani.si

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A. Juriˇ<strong>si</strong>ć in V. Batagelj: Verjetnostni račun in statistika 108<br />

✬<br />

Primer: Denimo, da je verjetnost, da ˇstudent naredi izpit iz Sociologije<br />

P (S) = 2/3. Verjetnost, da naredi izpit iz Politologije je P (P ) = 5/9.<br />

Če je verjetnost, da naredi vsaj enega od obeh izpitov P (S ∪ P ) = 4/5,<br />

kolikˇsna je verjetnost, da naredi oba izpita?<br />

✫<br />

P (S ∩ P ) = P (S) + P (P ) − P (S ∪ P ) =<br />

= 2<br />

3<br />

+ 5<br />

9<br />

− 4<br />

5<br />

= 0, 42.<br />

Univerza v Ljubljani ▲<br />

❙ ▲<br />

▲<br />

● ❙ ▲<br />

▲<br />

☛ ✖<br />

▲<br />

✩<br />

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