Regression analysis has produced the following results from the batch production costs for each of the past 5 months. Ex = 540, 2y = 755, 2x2 = 61,000, Exy = 83,920 Which of the following is the appropriate value for b in the regression line to 2 decimal places? O a. 1.40 b: 0.01 c. 0.89 d-1.40