Table 1.

The linguistic variables and trapezoidal fuzzy numbers.

Linguistic Variable	Trapezoidal Fuzzy Number
Very good	[0.8, 0.9, 0.9, 1]
Good	[0.6, 0.7, 0.7, 0.8]
Fair	[0.4, 0.5, 0.5, 0.6]
Bad	[0.2, 0.3, 0.3, 0.4]
Very bad	[0, 0.1, 0.1, 0.2]