b) 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.) 5 8 114 18 Performance Observation (seconds) Element Rating 1 2 3 4 Grasp and place bag 110% 7 9 9 11 Fill bag 85% 37 40 39 35 Seal bag 100% 14 18 14 19 Place bag on conveyor 85% 7 7 8 314 * Bag breaks open; included as delay in the allowance factor ^ Conveyor jams; included as delay in the allowance factor a) The standard time for this process = seconds (round your response to two decimal places). 35