Fuzzy Logic (Example of Computing Curves for More Than 2 Sets)

Here I will exemplify calculations for Fuzzy Logic which has curves of more than 2 sets.

This is a grouping for values ​​consisting of 4 sets, which consist of:

Less = 50 - 65

Enough = 60 - 80

Good = 75 - 90

Very Good = 85 - 95

If X is worth 77, then the calculation is as follows :