probabilité Flashcards

1
Q

𝞨 est appelé

A

l’évenement certain ou l’univers

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2
Q

∅ est appelle

A

l’évenement impossible

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3
Q

A et B sont incompatibles si:

A

A ⋂ B = ∅ càd si A et B sont disjoints

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4
Q

A⋃B correspond à

A

A ou B

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5
Q

A⋂B correspond à

A

A et B

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6
Q

pour tous évenements incompatible A et B P(A⋃B)

A

P(A⋃B)=P(A)+P(B)

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7
Q

pour tous évenements compatible A et B P(A⋃B)

A

P(A⋃B)= P(A)+P(B)-P(A∩B)

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8
Q

si probabilité uniforme P(A)=

A

p(A)=card(A)/card(𝞨)

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9
Q

P(A/E)=

A

P(A⋂E)/P(E)

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10
Q

formule des probabilités composés
P(A⋂B)

A

P(A⋂B)=P(A)*P(B/A)

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11
Q

formule des probabilités totale

A

P(B)=P(B/A)P(A)+P(B/Ā)P(Ā)

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12
Q

formule des probabilités totale 2.0

A

P(B)=∑(i=1 à n) P(B/Ai)P(Ai)

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13
Q

formule de bayes ou formule de causes

A

P(Ai/B)=P(B/Ai)P(Ai) / ∑(k=1à n) P(B/Ak)P(Ak)

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14
Q

A et B sont indépendant si

A

P(A∩B)=P(A)*P(B)

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15
Q

P(∩ i∊I Ai)=

A

P(∩ i∊I Ai)=∏(i∊I) P(Ai)

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