Given the following rules in a “back-chaining” expert system application:

A ∧ not(B) ⇒ C (.9)

C v D ⇒ E (.75)

F ⇒ A (.6)

G ⇒ D (.8)

The system can conclude the following facts (with confidences):
F(.9)
B(−.8)
G(.7)
Use the Stanford certainty factor algebra to determine E and its confidence.