a) Compute the standard time for the bag-packing task. b) How many observations are necessary for 99% confidence, within 5% accuracy?

The Dubuque Cement Company packs 80-pound bags of concrete mix. Time-study data for the filling activity are shown in the following table. Because of the high physical demands of the job, the company's policy is a 23% allowance for workers. (Round all intermediate calculations to two decimal places before proceeding with further calculations.) 1 Element Grasp and place bag Fill bag Seal bag Place bag on conveyor Performance Rating 105% 85% 100% 95% 8 36 15 7 Observation (seconds) 2 3 4 10 7 11 42 40 36 17 13 21 6 10 30 5 8 114 17 36 Bag breaks open; included as delay in the allowance factor Conveyor jams; included as delay in the allowance factor