37. The forecast for the monthly demand of a product is given in the table below. Month Forecast Actual Sales 1 32.00 30.00 2 31.80 32.00 3 31.82 30.00 The forecast is made by using the exponential smoothing method. The exponential smoothing coefficient used in forecasting the demand is (A) 0.10 (B) 1.00 (C) 0.40 (D) 0.50 38. One kg of air in a closed system undergoes an irreversible process from an initial state of p = 1 bar (absolute) and T = 27C, to a final state of p2 = 3 bar (absolute) and T2 = 127C. If the gas constant of air is 287 J/kg.K and the ratio of the specific heats y = 1.4, then the change in the specific entropy (in J/kg.K) of the air in the process is (A) 172.0 (C) -26.3 (B) 28.4 (D) indeterminate, as the process is irreversible /2 39. For the integral (8+4 cosx)dx, the absolute percentage error in numerical evaluation with the (round off to one decimal place). Trapezoidal rule, using only the end points, is