2. 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 25% allowance for workers. (Round all intermediate calculations to two decimal places before proceeding with further calculations.) Observation (seconds) 2 3 4 1 Element Grasp and place bag Fill bag Seal bag Place bag on conveyor Performance Rating 105% 80% 105% 7 36 15 10 40 16 7 9 39 14 10 11 35 20 5 8 112* 17 85% 9 30^ 361 * 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). b) The number of observations that are required for a 90% confidence level within 5% accuracy = observations (round your response up to the next whole number)