Probabilités Flashcards

1
Q

E(X); non bernoulli

A

n
∑ xi*P(X=xi)
i=1

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2
Q

Var(X); non bernoulli

A

E(X^2)-E(X)

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3
Q

V(aX+b)

A

a^2*V(X)

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4
Q

E(aX+b)

A

aE(X)+b

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5
Q

Conditions pour Bernoulli

A
  • expérience à deux issues
  • la probabilité d’obtenir un succès est égale à p,
  • la probabilité d’obtenir un échec est égale à 1 – p.
    -identiques
  • indépendantes= successives
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6
Q

Calcul de k

A

P(X = k) = Binomial[n,k]* p^k*(1-p)^n-k

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7
Q

E(X) =

A

n xp

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8
Q

V(X) =

A

n x p x (1 – p)

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9
Q

σ(X) =

A

√ V (X)

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10
Q

P a(B)

A

P(A inter B)/P(A)

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