QUERY: Example $2$

What is the mean income of a Very Young

person with a Very Good education?

We desire an answer more useful $/$ specific than

"Very High" or "Probably High"

Approximate reasoning algorithms can be designed

similarly

Answer in the form of a fuzzy set, e$.$g$.$

$\{.\frac{1}{30}+.\frac{2}{40}+.\frac{5}{50}+.\frac{6}{60}+.\frac{8}{70}+.\frac{8}{80}+.\frac{5}{90}\}$