Probabilites Flashcards

1
Q

La variance de la variable aléatoire

A

V(x) = p1 (x1 - E(x))² + p2 (x2 - E(x))² + pn (xn - E(x))²

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2
Q

L’écart-type de la variable aléatoire X

A

σ(X) = √ V(x)

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3
Q

La loi binomial

A

n
P(x=k) = (. ) p^k (1-p)^n-k
k
Le nombre chemin x la proba de succès x la proba d’échec

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4
Q

Si X suit la moi binomial l’espérance est

A

E(x) = np

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5
Q

Si X suit la moi binomial la variable est

A

V(x) = np ( 1-p)

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6
Q

Si X suit la moi binomial l’écart type est

A

σ(X) = √ V(x)

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7
Q

Espérance de la variable aléatoire X

A

E(x) = p1x1 + p2x2 + … + pnxn

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