A manager states that his process is really working well. Out of 1,520 parts, 1,495 were produced free of a particular defect and passed inspection. a. Calculate the defects per million opportunities (DPMO). (Round your answer to the nearest whole number.) b. Calculate the defective rate. (Round your answer to 3 decimal places.) c. Based on Six-Sigma theory, how would you rate this performance? Not so good Good A retail store had sales of $44,000 in April and $55,140 in May. The store employs eight full-time workers who work a 40-hour week. In April the store also had six part-time workers at 11 hours per week, and in May the store had seven part-timers at 16 hours per week (assume four weeks in each month). Using sales dollars as the measure of output, what is the percentage change in productivity (dollars output per labor hour) from April to May? (Round your intermediate calculations and final answer to 2 decimal places.)