Colles : semaine 19 XII Variables aléatoires XII.A Dé nitions

TSI1
X2X
0
V(X) = EhX−E(X)2V(aX +b) = a2V(X)
(E) : x00 +a(t)x0+b(t)x=c(t)
ϕ(E)
x(t) = ϕ(t)z(t)
z00 (t) + z0(t)ha(t)+2ϕ0(t)
ϕ(t)i=c(t) ϕ(t)