Defuzzification

$out(x)={\sum }_{k=1}^R\frac{{\kappa }_k{b}_k(x)}{{\sum }_{l=1}^R{\kappa }_l{b}_l(x)}{w}_k$ with $R$ the number of rules and $\kappa$ the belief factors ${\sum }_{k=1}^R{\kappa }_k=1{\kappa }_k>0.$