A producer of industrial resins is currently evaluating 3 technologies that it is currently using, with the intention of phasing at least one technology out and standardizing. This table shows cost data for producing a batch of a particular resin using each of the 3 technologies. Batches Mean Median Variance S.E. Mean Technology 1 25 77.39 78.55 0.64 Technology 2 36 76.56 74.38 15.11 0.65 Technology 3 49 72.44 71.27 13.86 Assuming normality, the 90% confidence interval for the mean cost per batch using Technology 1 is: O a. 76.33 to 78.45 b. 76.75 to 78.03 O c. 76.29 to 78.49 O d. 76.55 to 78.23