“…The example values of trapezoidal membership function (TNF) for our three linguistic variables are as follows: as Low (l1), the TNF (o,p,q,r) is (2,3,4,5). Similarly for Medium(l2) is (4,5,6,7) and High (l3) is (6,7,8,9). The values for these three linguistic variables are assumed as follows: value of Low ¼ 0.3, Medium ¼ 0.6, and High ¼ 0.9 on y-axis to draw respective membership function.…”