mathvariables.py

Created on February 07, 2021

373 Bytes

Univers = Omega (cheval)

Loi de probabilite de X (tableau):
valeur     x1       x2       x3
proba.  p(X=x1)  p(X=x2)  p(X=x3)

Esperance de X:
E(X)= x1*p1 + x2*p2 + ... + xn*pn

Variance de X:
V(x)= p1*[x1-E(X)]2 + p2*[x2-E(X)]2

Ecart type de X:
ro(X)= sqrt(V(X))


Soient X une variable aléatoire,
a et b deux réels:
E(aX+b)= aE(X)+b
V(aX)= a2V(X)

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