P.fuzzification

Linguistic qualifier

0, 450, 500

Very low (1)

450, 680, 1000

Low (2)

680, 840, 1500

Medium (3)

1000, 1270, 2000

High (4)

1500, 1810, 2500

Very high (5)

2000, 2490, 3000

Excellent (6)