Bonjour Jekifflesmath
Exercice 1
1) Arbre en pièce jointe.
[tex]2)\ P(\overline{D})=0,65\times0,92+0,35\times0,95\\\\\boxed{P(\overline{D})=0,9305}\\\\3)\ P_{\overline{D}}(A)=\dfrac{P(A\cap\overline{D})}{P(\overline{D})}\\\\P_{\overline{D}}(A)=\dfrac{0,65\times0,92}{0,9305}\\\\\boxed{P_{\overline{D}}(A)\approx0,64}[/tex]
Exercice 2
[tex]1)\ P(S)=0,40\times0,80+0,60\times0,95\\\\\boxed{P(S) = 0,89}[/tex]
[tex]2)\ P_S(A)=\dfrac{P(A\cap S)}{P(S)}\\\\P_S(A)=\dfrac{0,4\times0,8}{0,89}\\\\\boxed{P_S(A)\approx0,36}[/tex]
