show workings....

(15.00 Points) 8 - As an analyst, we would like to perform a work sampling study on an assembly line. The jobs can be differentiated on the basis of the product size: A, B, and C. We perform a study over a five-week period that equals 200 working hours. There are 12 workers to be examined. In total, we perform 1140 observations. Yet, the worker absences led to 15 worker-day deduction from the total working hours where workers work 8 hour each day. The study results are tabulated below. Queston: What is the mean assembly time per product unit for size C? A B Others Category Number of observations Number of units completed 220 293 385 242 600 1123 3025 (none) a) 0.2545 b) O 0.0959 C) 0.7537 d) 0.0212 e) O 0.0661 O Leave blank