Fuzzy Weighted Average and Application 
Reference
Books:
- Gerla G., Fuzzy Logic Programming and fuzzy control, Studia Logica, 79 (2005) 231-254.
- Hájek P., Metamathematics of Fuzzy Logic, Kluwer Academic Publishers, Dordrecht, The Netherlands, 1998.
- Mamdani, E. H., Application of fuzzy algorithms for the control of a simple dynamic plant. In Proc IEEE (1974), 121-159.