Can any one help me to aggregate the result of belief rule expert system?

for example

If (Coughing more than 3 weeks is medium) and (Coughing up blood is High) and (Chest pain is High) and (Fatigue is Low) and (Prolonged fever is medium) and (Lack of appetite is Low) and (Weight loss is High) and (Night sweating is Low) THEN TB suspicion is (High, 0.8), (Medium, 0.2), (Low, 0.0)

is there any equation to aggregate the result TB suspicion is (High, 0.8), (Medium, 0.2), (Low, 0.0) ???

see the attached the paper as you can understood my question